Temporal range: Early Pliocene to Early Holocene, 5–0.0045 Ma
|Columbian mammoth in the Page Museum in Los Angeles.|
(Blumenbach, 1799 [originally Elephas])
A mammoth is any species of the extinct genus Mammuthus, proboscideans commonly equipped with long, curved tusks and, in northern species, a covering of long hair. They lived from the Pliocene epoch (from around 5 million years ago) into the Holocene at about 4,500 years ago in Africa, Europe, Asia, and North America. They were members of the family Elephantidae, which also contains the two genera of modern elephants and their ancestors.
The earliest known proboscideans, the clade that contains the elephants, existed about 55 million years ago around the Tethys Sea area. The closest relatives of the Proboscidea are the sirenians and the hyraxes. The family Elephantidae is known to have existed six million years ago in Africa, and includes the living elephants and the mammoths. Among many now extinct clades, the mastodon is only a distant relative of the mammoths, and part of the separate Mammutidae family, which diverged 25 million years before the mammoths evolved.
Since many remains of each species of mammoth are known from several localities, it is possible to reconstruct the evolutionary history of the genus through morphological studies. Mammoth species can be identified from the number of enamel ridges on their molars; the primitive species had few ridges, and the amount increased gradually as new species evolved and replaced the former ones. At the same time, the crowns of the teeth became longer, and the skulls become higher from top to bottom and shorter from the back to the front over time to accommodate this.
The first known members of the genus Mammuthus are the African species M. subplanifrons from the Pliocene and M. africanavus from the Pleistocene. The former is thought to be the ancestor of later forms. Mammoths entered Europe around 3 million years ago; the earliest known type has been named M. rumanus, which spread across Europe and China. Only its molars are known, which show it had 8–10 enamel ridges. A population evolved 12–14 ridges and split off from and replaced the earlier type, becoming M. meridionalis. In turn, this species was replaced by the steppe mammoth, M. trogontherii, with 18–20 ridges, which evolved in East Asia ca. 1 million years ago. Mammoths derived from M. trogontherii evolved molars with 26 ridges 200,000 years ago in Siberia, and became the woolly mammoth, M. primigenius. The Columbian mammoth, M. columbi, evolved from a population of M. trogontherii that had entered North America. A 2011 genetic study showed that two examined specimens of the Columbian mammoth were grouped within a subclade of woolly mammoths. This suggests that the two populations interbred and produced fertile offspring. It also suggested that a North American form known as "M. jeffersonii" may be a hybrid between the two species.
By the late Pleistocene, mammoths in continental Eurasia had undergone a major transformation, including a shortening and heightening of the cranium and mandible, increase in molar hypsodonty index, increase in plate number, and thinning of dental enamel. Due to this change in physical appearance, it became customary to group European mammoths separately into distinguishable clusters:
- Early Pleistocene – Mammuthus meridionalis
- Middle Pleistocene – Mammuthus trogontherii
- Late Pleistocene – Mammuthus primigenius
There is speculation as to what caused this variation within the three chronospecies. Variations in environment, climate change, and migration surely played roles in the evolutionary process of the mammoths. Take M. primigenius for example: Woolly mammoths lived in opened grassland biomes. The cool steppe-tundra of the Northern Hemisphere was the ideal place for mammoths to thrive because of the resources it supplied. With occasional warmings during the ice age, climate would change the landscape, and resources available to the mammoths altered accordingly.
Etymology and early observations
The word mammoth was first used in Europe during the early 1600s, when referring to maimanto tusks discovered in Siberia. John Bell, who was on the Ob River in 1722, said that mammoth tusks were well known in the area. They were called "mammon's horn" and were often found in washed-out river banks. Some local people claimed to have seen a living mammoth, but they only came out at night and always disappeared under water when detected. He bought one and presented it to Hans Sloan who pronounced it an elephant's tooth.
The folklore of some native peoples of Siberia, who would routinely find mammoth bones, and sometimes frozen mammoth bodies, in eroding river banks, had various interesting explanations for these finds. Among the Khanty people of the Irtysh River basin, a belief existed that the mammoth was some kind of a water spirit. According to other Khanty, the mammoth was a creature that lived underground, burrowing its tunnels as it went, and would die if it accidentally came to the surface. The concept of the mammoth as an underground creature was known to the Chinese, who received some mammoth ivory from the Siberian natives; accordingly, the creature was known in China as yin shu 隐鼠, "the hidden rodent".
Thomas Jefferson, who famously had a keen interest in paleontology, is partially responsible for transforming the word mammoth from a noun describing the prehistoric elephant to an adjective describing anything of surprisingly large size. The first recorded use of the word as an adjective was in a description of a large wheel of cheese (the "Cheshire Mammoth Cheese") given to Jefferson in 1802.
Like their modern relatives, mammoths were quite large. The largest known species reached heights in the region of 4 m (13 ft) at the shoulder and weights of up to 8 tonnes (8.8 short tons), while exceptionally large males may have exceeded 12 tonnes (13 short tons). However, most species of mammoth were only about as large as a modern Asian elephant (which are about 2.5 m to 3 m high at the shoulder, and rarely exceeding 5 tonnes). Both sexes bore tusks. A first, small set appeared at about the age of six months, and these were replaced at about 18 months by the permanent set. Growth of the permanent set was at a rate of about 2.5 to 15.2 cm (1 to 6 in) per year.
Based on studies of their close relatives, the modern elephants, mammoths probably had a gestation period of 22 months, resulting in a single calf being born. Their social structure was probably the same as that of African and Asian elephants, with females living in herds headed by a matriarch, whilst bulls lived solitary lives or formed loose groups after sexual maturity.
Scientists discovered and studied the remainders of a mammoth calf and found that the fat in a mammoth plays a major role in the mammoth's form and ability to store large amounts of nutrients to accommodate to the colder climate they live in, thereby surviving temperatures as low as −50 °C (−58 °F). The fat also allowed the mammoths to increase their muscle mass, allowing the mammoths to fight against enemies and live longer.
Depending on the species or race of mammoth, the diet differed somewhat depending on location, although all mammoths ate similar things. For the Columbian mammoth, M. columbi, the diet was mainly grazing. American Columbian mammoths fed primarily on cacti leaves, trees, and shrubs. These assumptions were based on mammoth feces and mammoth teeth. Mammoths, like modern day elephants, have hypsodont molars. These features also allowed mammoths to live an expansive life because of the availability of grasses and trees.
For the Mongochen mammoth, its diet consisted of herbs, grasses, larch, and shrubs, and possibly alder. These inferences were made through the observation of mammoth feces, which scientists observed contained non-arboreal pollen and moss spores.
The Yamal baby mammoth Lyuba, found in 2007 in the Yamal Peninsula in Western Siberia, suggests that baby mammoths, as do modern baby elephants, ate the dung of adult animals. The evidence to show this is that the dentition (teeth) of the baby mammoth had not yet fully developed to chew grass. Furthermore, there was an abundance of ascospores of coprophilous fungi from the pollen spectrum of the baby's mother. Coprophilous fungi are fungi that grow on animal dung and disperse spores in nearby vegetation, which the baby mammoth would then consume. Spores might have gotten into its stomach while grazing for the first few times. Coprophagy may be an adaptation, serving to populate the infant's gut with the needed microbiome for digestion.
The woolly mammoth (M. primigenius) was the last species of the genus. Most populations of the woolly mammoth in North America and Eurasia, as well as all the Columbian mammoths (M. columbi) in North America, died out around the time of the last glacial retreat, as part of a mass extinction of megafauna in northern Eurasia and the Americas. Until recently, the last woolly mammoths were generally assumed to have vanished from Europe and southern Siberia about 12,000 years ago, but new findings show some were still present there about 10,000 years ago. Slightly later, the woolly mammoths also disappeared from continental northern Siberia. A small population survived on St. Paul Island, Alaska, up until 3750 BC, and the small mammoths of Wrangel Island survived until 1650 BC. Recent research of sediments in Alaska indicates mammoths survived on the American mainland until 10,000 years ago.
A definitive explanation for their extinction has yet to be agreed. The warming trend (Holocene) that occurred 12,000 years ago, accompanied by a glacial retreat and rising sea levels, has been suggested as a contributing factor. Forests replaced open woodlands and grasslands across the continent. The available habitat would have been reduced for some megafaunal species, such as the mammoth. However, such climate changes were nothing new; numerous very similar warming episodes had occurred previously within the ice age of the last several million years without producing comparable megafaunal extinctions, so climate alone is unlikely to have played a decisive role. The spread of advanced human hunters through northern Eurasia and the Americas around the time of the extinctions, however, was a new development, and thus might have contributed significantly.
Whether the general mammoth population died out for climatic reasons or due to overhunting by humans is controversial. During the transition from the Late Pleistocene epoch to the Holocene epoch, there was shrinkage of the distribution of the mammoth because progressive warming at the end of the Pleistocene epoch changed the mammoth's environment. The mammoth steppe was a periglacial landscape with rich herb and grass vegetation that disappeared along with the mammoth because of environmental changes in the climate. Mammoths had moved to isolated spots in Eurasia, where they disappeared completely. Also, it is thought that Late Paleolithic and Mesolithic human hunters might have affected the size of the last mammoth populations in Europe. There is evidence to suggest that humans did cause the mammoth extinction, although there is no definitive proof. It was found that humans living south of a mammoth steppe learned to adapt themselves to the harsher climates north of the steppe, where mammoths resided. It was concluded that if humans could survive the harsh north climate of that particular mammoth steppe then it was possible humans could hunt (and eventually extinguish) mammoths everywhere. Another hypothesis suggests mammoths fell victim to an infectious disease. A combination of climate change and hunting by humans may be a possible explanation for their extinction. Homo erectus is known to have consumed mammoth meat as early as 1.8 million years ago, though this may mean only successful scavenging, rather than actual hunting. Later humans show greater evidence for hunting mammoths; mammoth bones at a 50,000 year old site in South Britain suggest that Neanderthals butchered the animals, while various sites in Eastern Europe dating from 15,000 to 44,000 years old suggest humans (probably Homo sapiens) built dwellings using mammoth bones (the age of some of the earlier structures suggests that Neanderthals began the practice). However, the American Institute of Biological Sciences also notes bones of dead elephants, left on the ground and subsequently trampled by other elephants, tend to bear marks resembling butchery marks, which have previously been misinterpreted as such by archaeologists.
Many hypotheses also seek to explain the regional extinction of mammoths in specific areas. Scientists have speculated that the mammoths of Saint Paul Island, an isolated enclave where mammoths survived until about 8,000 years ago, died out as the island shrank by 80–90% when sea levels rose, eventually making it too small to support a viable population. Similarly, genome sequences of the Wrangel Island mammoths indicate a sharp decline in genetic diversity, though the extent to which this played a role in their extinction is still unclear. Another hypothesis, said to be the cause of mammoth extinction in Siberia, comes from the idea that many may have drowned. While traveling to the Northern River, many of these mammoths broke through the ice and drowned. This also explains bones remains in the Arctic Coast and islands of the New Siberian Group.
Dwarfing occurred with the pygmy mammoth on the outer Channel Islands of California, but at an earlier period. Those animals were very likely killed by early Paleo-Native Americans, and habitat loss caused by a rising sea level that split Santa Rosae into the outer Channel Islands.
The use of preserved genetic material to create living mammoth specimens, particularly in regard to the woolly mammoth, has long been discussed theoretically but has only recently become the subject of formal effort. As of 2015, there are three major ongoing projects, one led by Akira Iritani of Japan, another by Hwang Woo-suk of South Korea, and the Long Now Foundation, attempting to create a mammoth-elephant hybrid.
In April 2015, Swedish scientists published the complete genome (complete DNA sequence) of the woolly mammoth. Meanwhile, a Harvard University team is already attempting to study the animals' characteristics by inserting some mammoth genes into Asian elephant stem cells. So far, the team placed mammoth genes involved in blood, fat and hair into elephant stem cells in order to study the effects of these genes in laboratory cultured cells. It is still unknown if the actual cloning of a living woolly mammoth is possible.
The projects are based on finding suitable mammoth DNA in frozen bodies, sequencing its genome and, if possible, gradually combining the DNA with elephant cells. If the cells turn viable in laboratory tests, the next challenge would be creating a viable "mammoth" hybrid embryo by inseminating an elephant egg in vitro. The percent mammoth contribution to the genome would be gradually increased on each hybrid embryo produced in vitro. If a viable hybrid embryo is obtained, it may be possible to implant it into a female Asian elephant housed in a zoo. With the current knowledge and technology, it is still unlikely that the hybrid embryo would be carried through the two-year gestation.
The dictionary definition of mammoth at Wiktionary
- "Woolly Mammoth (Mammuthus primigenius)". The Academy of Natural Sciences of Drexel University. Retrieved 2012-03-07.
- Dale Guthrie, R. (2004). "Radiocarbon evidence of mid-Holocene mammoths stranded on an Alaskan Bering Sea island". Nature 429 (6993): 746–749. doi:10.1038/nature02612. PMID 15201907.
- Lister, A.; Bahn, P. (2007). Mammoths – Giants of the Ice Age (3rd ed.). London: Frances Lincoln. ISBN 978-0520261600.
- Shoshani, J.; Ferretti, M. P.; Lister, A. M.; Agenbroad, L. D.; Saegusa, H.; Mol, D.; Takahashi, K. (2007). "Relationships within the Elephantinae using hyoid characters". Quaternary International. 169-170: 174. Bibcode:2007QuInt.169..174S. doi:10.1016/j.quaint.2007.02.003.
- Lister, A. M.; Sher, A. V.; Van Essen, H.; Wei, G. (2005). "The pattern and process of mammoth evolution in Eurasia". Quaternary International. 126–128: 49. Bibcode:2005QuInt.126...49L. doi:10.1016/j.quaint.2004.04.014.
- Enk, J.; Devault, A.; Debruyne, R.; King, C. E.; Treangen, T.; O'Rourke, D.; Salzberg, S. L.; Fisher, D.; MacPhee, R.; Poinar, H. (2011). "Complete Columbian mammoth mitogenome suggests interbreeding with woolly mammoths". Genome Biology 12 (5): R51. doi:10.1186/gb-2011-12-5-r51. PMC 3219973. PMID 21627792.
- Nogués-Bravo, D.; Rodríguez, J. S.; Hortal, J. N.; Batra, P.; Araújo, M. B. (2008). Barnosky, Anthony, ed. "Climate Change, Humans, and the Extinction of the Woolly Mammoth". PLoS Biology 6 (4): e79. doi:10.1371/journal.pbio.0060079. PMC 2276529. PMID 18384234.
- Stuart, A. J. (2005). "The extinction of woolly mammoth (Mammuthus primigenius) and straight-tusked elephant (Palaeoloxodon antiquus) in Europe". Quaternary International. 126–128: 171–177. Bibcode:2005QuInt.126..171S. doi:10.1016/j.quaint.2004.04.021.
- Lister, A.; Bahn, P. (2007). Mammoths – Giants of the Ice Age (3rd ed.). London: Frances Lincoln. p. 49. ISBN 978-0520261600.
- John Bell, Travels from St Petersburg in Russia to diverse parts of Asia, Edinburgh, 1806, pages 383-386
- Patkanov, S. (1897), Die lrtysch-Ostjaken und ihre Volkspoesie I, St. Petersburg, pp. 123–124
- Laufer, Berthold (1913), "Arabic and Chinese Trade in Walrus and Narwhal Ivory", T'oung Pao, Second Series 14 (3): 329. Bertholds's source for the Irtysh Ostyaks' belief is Patkanov 1897, pp. 123–124
- Simpson, J. (2009). "Word Stories: Mammoth." Oxford English Dictionary Online, Oxford University Press. Accessed 05-JUN-2009.
- Agenbroad, Larry; Nelson, Lisa. Mammoths. Minneapolis: Lerner. p. 34. ISBN 978-0-8225-2862-3.
- "Columbian Mammoth & Channel Island Mammoth". San Diego Zoo. Retrieved 2010-06-15.
- Peter D. Moore (2008). Tundra. Facts On File. p. 198. ISBN 978-0-8160-5933-1.
- Maschenko, E. N.; Boeskorov, G. G.; Baranov, V. A. (2013). "Morphology of a mammoth calf (Mammuthus primigenius) from Ol'chan (Oimiakon, Yakutia)". Paleontological Journal 47 (4): 425. doi:10.1134/S0031030113040096.
- Pérez-Crespo, V. C. A. N.; Arroyo-Cabrales, J. N.; Benammi, M.; Johnson, E.; Polaco, O. J.; Santos-Moreno, A.; Morales-Puente, P.; Cienfuegos-Alvarado, E. (2012). "Geographic variation of diet and habitat of the Mexican populations of Columbian Mammoth (Mammuthus columbi)". Quaternary International. 276–277: 8–16. Bibcode:2012QuInt.276....8P. doi:10.1016/j.quaint.2012.03.014.
- Kosintsev, P. A.; Lapteva, E. G.; Korona, O. M.; Zanina, O. G. (2012). "Living environments and diet of the Mongochen mammoth, Gydan Peninsula, Russia". Quaternary International. 276-277: 253. Bibcode:2012QuInt.276..253K. doi:10.1016/j.quaint.2011.11.004.
- García-Alix, A.; Delgado Huertas, A.; Martín Suárez, E. (2012). "Unravelling the Late Pleistocene habitat of the southernmost woolly mammoths in Europe". Quaternary Science Reviews 32: 75. Bibcode:2012QSRv...32...75G. doi:10.1016/j.quascirev.2011.11.007.
- Willerslev, E.; Davison, J.; Moora, M.; Zobel, M.; Coissac, E.; Edwards, M. E.; Lorenzen, E. D.; Vestergård, M.; Gussarova, G.; Haile, J.; Craine, J.; Gielly, L.; Boessenkool, S.; Epp, L. S.; Pearman, P. B.; Cheddadi, R.; Murray, D.; Bråthen, K. A.; Yoccoz, N.; Binney, H.; Cruaud, C.; Wincker, P.; Goslar, T.; Alsos, I. G.; Bellemain, E.; Brysting, A. K.; Elven, R.; Sønstebø, J. R. H.; Murton, J.; et al. (2014). "Fifty thousand years of Arctic vegetation and megafaunal diet". Nature 506 (7486): 47–51. doi:10.1038/nature12921. PMID 24499916.
- Hsieh, T. H.; Chen, J. J. J.; Chen, L. H.; Chiang, P. T.; Lee, H. Y. (2011). "Time-course gait analysis of hemiparkinsonian rats following 6-hydroxydopamine lesion". Behavioural Brain Research 222 (1): 1–9. doi:10.1016/j.bbr.2011.03.031. PMID 21435355.
- Veltre, D. W.; Yesner, D. R.; Crossen, K. J.; Graham, R. W.; Coltrain, J. B. (2008). "Patterns of faunal extinction and paleoclimatic change from mid-Holocene mammoth and polar bear remains, Pribilof Islands, Alaska". Quaternary Research 70: 40. doi:10.1016/j.yqres.2008.03.006.
- Enk, J. M.; Yesner, D. R.; Crossen, K. J.; Veltre, D. W.; O'Rourke, D. H. (2009). "Phylogeographic analysis of the mid-Holocene Mammoth from Qagnaxˆ Cave, St. Paul Island, Alaska". Palaeogeography, Palaeoclimatology, Palaeoecology 273: 184. doi:10.1016/j.palaeo.2008.12.019.
- Tikhonov, Alexei; Larry Agenbroad; Sergey Vartanyan (2003). "Comparative analysis of the mammoth populations on Wrangel Island and the Channel Islands". DEINSEA 9: 415–420. ISSN 0923-9308.
- Arslanov, K., Cook, G.T. , Gulliksen, S., Harkness, D.D., Kankainen, T., Scott, E.M., Vartanyan, S., and Zaitseva, G.I. (1998). "Consensus Dating of Remains from Wrangel Island". Radiocarbon 40 (1): 289–294. Retrieved 2012-03-07.
- Vartanyan, S. L.; Arslanov, Kh. A.; Tertychnaya, T. V.; Chernov, S. B. (1995). "Radiocarbon Dating Evidence for Mammoths on Wrangel Island, Arctic Ocean, until 2000 BC". Radiocarbon (Department of Geosciences, The University of Arizona) 37 (1): 1–6. Retrieved 2008-01-10.
- Haile, J.; Froese, D. G.; MacPhee, R. D. E.; Roberts, R. G.; Arnold, L. J.; Reyes, A. V.; Rasmussen, M.; Nielsen, R.; Brook, B. W.; Robinson, S.; Demuro, M.; Gilbert, M. T. P.; Munch, K.; Austin, J. J.; Cooper, A.; Barnes, I.; Moller, P.; Willerslev, E. (2009). "Ancient DNA reveals late survival of mammoth and horse in interior Alaska". Proceedings of the National Academy of Sciences 106 (52): 22352. Bibcode:2009PNAS..10622352H. doi:10.1073/pnas.0912510106.
- Martin, P. S. (2005). Twilight of the Mammoths: Ice Age Extinctions and the Rewilding of America (Illustrated ed.). University of California Press. ISBN 0520231414. OCLC 58055404. Retrieved 2014-11-11.
- Burney, D.; Flannery, T. (2005). "Fifty millennia of catastrophic extinctions after human contact". Trends in Ecology & Evolution 20 (7): 395–401. doi:10.1016/j.tree.2005.04.022. PMID 16701402.
- Fountain, Henry (22 December 2009). "DNA Shifts Timeline For Mammoths' Exit". The New York Times. p. 3. Retrieved 8 August 2010.
- Levy, S. (2006). "Clashing with Titans". BioScience 56 (4): 292–292. doi:10.1641/0006-3568(2006)56[292:CWT]2.0.CO;2.
- Sapsted, David (June 26, 2002). "Woolly mammoth butchery site unearthed". The Telegraph.
- Gray, Richard (December 18, 2011). "Neanderthals built homes with mammoth bones". Telegraph.co.uk. Retrieved March 10, 2015.
- Schirber, Michael (October 19, 2004). "Surviving Extinction: Where Woolly Mammoths Endured". livescience.
- "Complete Genomes Reveal Signatures of Demographic and Genetic Declines in the Woolly Mammoth". Current Biology 25: 1395–1400. doi:10.1016/j.cub.2015.04.007.
- Mammoth genome sequence completed. BBC News, 23 April 2015.
- The Long Now Fouldation - Revive and Restore.
- Timmons, Jeanne (January 7, 2013). "Could Ancient Giants Be Cloned? Is It Possible, And Is It Wise?". Valley News.
- Mammoth genome sequence completed. BBC News, 23 April 2015.
- Webster, Ben (2015-03-23). "Scientist takes mammoth-cloning a step closer". The Sunday Times.
- "SOOAM BRF". sooam.com.
- "Mammoth: Back from the Dead". National Geographic Channel.
- The Plan to Turn Elephants Into Woolly Mammoths Is Already Underway. 21 May 2014.
|Wikimedia Commons has media related to Mammuthus.|
|Wikispecies has information related to: Mammuthus|
|Wikisource has the text of the 1879 American Cyclopædia article Mammoth.|
- Bahn, Paul G.; Lister, Adrian (1994). Mammoths. New York: Macmillan USA. ISBN 0-02-572985-3.
- Capelli, C.; MacPhee, R. D. E.; Roca, A. L.; Brisighelli, F.; Georgiadis, N.; o’Brien, S. J.; Greenwood, A. D. (2006). "A nuclear DNA phylogeny of the woolly mammoth (Mammuthus primigenius)". Molecular Phylogenetics and Evolution 40 (2): 620–627. doi:10.1016/j.ympev.2006.03.015. PMID 16631387.
- Conniff, R. (2010). "Mammoths and Mastodons: All American Monsters". Smithsonian Magazine. Retrieved 2012-03-07.
- "Mammoth genome cracked: key to cloning". COSMOS magazine. 2008. Retrieved 2012-03-07.
- "National Park Service Findings 'Good News' For Waco Mammoth Site". Baylor University. Retrieved 2012-03-07.
- Hayes, J. (2006). "Back from the dead". COSMOS magazine. Retrieved 2012-03-07.
- Keddie, G. "The Mammoth Story" (PDF). Royal BC Museum. Retrieved 2012-03-07.
- Levy, S. (2006). "Clashing with Titans". BioScience 56 (4): 292–292. doi:10.1641/0006-3568(2006)56[292:CWT]2.0.CO;2.
- Martin, Paul (2005). Twilight of the mammoths: ice age extinctions and the rewilding of America. Berkeley: University of California Press. ISBN 0-520-23141-4.
- Mercer, Henry Chapman (2010) . The Lenape Stone: Or The Indian And The Mammoth (1885). Kessinger Publishing, LLC. ISBN 1161697535.
- Rodgers, J. (2006). "Mammoth skeleton found in Siberia". BBC News. Retrieved 2012-03-07.
- Stone, Richard G. (2003). Mammoth: The Resurrection of an Ice Age Giant. Fourth Estate Ltd. ISBN 1-84115-518-7.