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ISBN 978-0-8493-4258-5. Gulls: Of North America, Europe, and Asia by Klaus Malling Olsen & Hans Larsson. Princeton University Press (2004). ISBN 978-0691119977....4 KB (524 words) - 16:12, 14 October 2023
Malling Olsen & Hans Larsson. Princeton University Press (2004). ISBN 978-0691119977. Alan Harris, Hadoram Shirihai & David Christie (1996) The Macmillan...4 KB (533 words) - 16:28, 1 February 2024
of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. Harrison, Peter (1991). Seabirds: An Identification Guide. Houghton...6 KB (692 words) - 03:03, 22 January 2024
Malling Olsen & Hans Larsson. Princeton University Press (2004). ISBN 978-0691119977. Heuglin's Gull, Gull Research Organization The "Herring Gull" Assemblage...5 KB (569 words) - 21:56, 15 May 2023
Malling Olsen & Hans Larsson. Princeton University Press (2004). ISBN 978-0691119977. Harrison, Peter, Seabirds: An Identification Guide. Houghton Mifflin...7 KB (840 words) - 08:24, 21 October 2023
of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. Harrison, Peter (1991). Seabirds: An Identification Guide. Houghton...7 KB (713 words) - 22:57, 21 December 2023
Malling Olsen & Hans Larsson. Princeton University Press (2004). ISBN 978-0691119977. CRC Handbook of Avian Body Masses by John B. Dunning Jr. (Editor)....5 KB (603 words) - 18:07, 24 October 2023
of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. Garner, Martin; Quinn, David (1997). "Identification of Yellow-legged...9 KB (992 words) - 09:04, 5 April 2024
Malling Olsen & Hans Larsson. Princeton University Press (2004). ISBN 978-0691119977. Olsen, Klaus Malling (2018). Gulls of the world : a photographic guide...11 KB (1,322 words) - 17:34, 16 October 2023
of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. Dementiev, G. P. and N. A. Gladkov. (1951). Ptitsi Sovietskogo Soyuza...9 KB (1,047 words) - 09:06, 17 February 2024
of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. Harrison, Peter (1991). Seabirds: An Identification Guide. Houghton...14 KB (1,675 words) - 03:05, 17 November 2023
Malling Olsen & Hans Larsson. Princeton University Press (2004). ISBN 978-0691119977. Harrison, Peter, Seabirds: An Identification Guide. Houghton Mifflin...11 KB (1,170 words) - 20:27, 3 February 2024
Of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. Harrison, Peter (1991). Seabirds: An Identification Guide. Houghton...10 KB (1,069 words) - 17:15, 8 March 2024
Of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. Tinbergen, Niko (1960). The Herring Gull's World. Basic Books, Inc...14 KB (1,843 words) - 23:29, 27 March 2024
of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. Zorrozua, Nere; Aldalur, Asier; Herrero, Alfredo; Diaz, Beñat; Delgado...15 KB (1,577 words) - 09:18, 3 April 2024
of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. Harrison, Peter (1991). Seabirds: An Identification Guide. Houghton...38 KB (4,143 words) - 06:14, 13 March 2024
of North America, Europe, and Asia. Princeton University Press. ISBN 978-0691119977. OCLC 869139988. Good, Thomas P. (1998). Poole, A. (ed.). "Great Black-backed...38 KB (4,335 words) - 04:37, 26 February 2024
