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guide to prehistoric life. Buffalo, N.Y.: Firefly Books. p. 23. ISBN 978-1-55407-181-4. White, E. I. "On Cephalaspis lyelli Agassiz." Palaeontology 1.2 (1958):...

Guide to Prehistoric Life. Italy: Firefly Books Ltd. p. 90. ISBN 978-1-55407-181-4. Phillips, J., 1871, Geology of Oxford and the Valley of the Thames...

prehistoric life (First ed.). Buffalo, N.Y.: Firefly Books. p. 134. ISBN 978-1-55407-181-4. The first Xiphactinus fossil was found during the 1850s in Kansas...

to Prehistoric Life. Richmond Hill, Ontario: Firefly Books. ISBN 978-1-55407-181-4. Benton, Michael J. (2001). "The Science of Walking with Dinosaurs"...

to Prehistoric Life. Italy: Firefly Books Ltd. pp. 116–117. ISBN 978-1-55407-181-4. Hajek, D. (2015). "Bankrolling A Dinosaur Dig And Unearthing A Giant:...

Complete Guide to Prehistoric Life. Firefly Books. pp. 70–71. ISBN 978-1-55407-181-4. Colbert, E. (1989). "The Triassic Dinosaur Coelophysis". Museum of...

to Prehistoric Life. Richmond Hill, Ontario: Firefly Books. ISBN 978-1-55407-181-4. "BBC News | Entertainment | BBC launches prehistoric saga". news...

Guide to Prehistoric Life. Italy: Firefly Books Ltd. p. 90. ISBN 978-1-55407-181-4. Prieto-Márquez, Albert; Carrera Farias, Miguel (2021). "A new late-surviving...