Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1896)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1899)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1900)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1903)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1923)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1890)

Ein ornithologischer Ausflug nach den Seen Saissan-nor und Marka-kul (in West-Sibirien) im Jahre 1909 - Poljakov, G. I. (1912)

Ornithologisches Jahrbuch (V. Tschusi, 1902)

Ornithologisches Jahrbuch (V. Tschusi, 1903)

Ornithologisches Jahrbuch (V. Tschusi, 1911)

The Ornithologist; a magazine of ornithology and oölogy. First series - Swann, H. Kirke (Harry Kirke), 1871 -1926 (John Bale & Sons, 1896)

Our living resources : a report to the nation on the distribution, abundance, and health of U.S. plants, animals, and ecosystems - United States. National Biological Service. (U.S. Dept. of the Interior, National Biological Service, 1995)

Our search for a wilderness; an account of two ornithological expeditions to Venezuela and to British Guiana - Beebe, William, 1877 -1962 (Constable, 1910)

Our search for a wilderness; an account of two ornithological expeditions to Venezuela and to British Guiana - Beebe, William, 1877 -1962 (H. Holt and company, 1910)

Our search for a wilderness : an account of two ornithological expeditions to Venezuela and to British Guiana - Beebe, William, 1877 -1962 (Holt, 1910)

Outline of a classification of North American birds - Oberholser, Harry C. (Harry Church), 1870 -1963 (1905)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (Young J. Pentland, 1895)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (D. Appleton & Co, 1895)

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (D. Appleton, 1895)

Pacific coast avifauna - Cooper Ornithological Club. (Cooper Ornithological Club, 1912)

Pacific science - University of Hawaii. (University Press of Hawaii, 1968)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 1996)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 1998)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 2013)

Palaeontology - Palaeontological Association (Palaeontological Association, 1984)

Palaeontology - Palaeontological Association (Palaeontological Association, 1994)

Parasitology (Cambridge University Press, 1921)

The passenger pigeon, its natural history and extinction - Schorger, A. W. (Arlie William), 1884 -1972 (University of Wisconsin Press, 1955)

P.D. Skaar's Montana bird distribution - Bergeron, Dwight. (Montana Natural Heritage Program, 1992)

P.D. Skaar's Montana bird distribution - Skaar, Palmer David. (Montana Natural Heritage Program, 1996)

Peninsula Field Naturalists' Club Newsletter - Australia (Peninsula Field Naturalists' Club, 2017)

Pennaraptoran theropod dinosaurs : past progress and new frontiers - Novas, Fernando E (American Museum of Natural History, 2020)

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Pflügers Archiv für die gesamte Physiologie des Menschen und der Tiere (M. Hager, 1921)

Physis - Sociedad Argentina de Ciencias Naturales. (Asociación Argentina de Ciencias Naturales [etc.], 1918)

The Pleistocene avifauna of the Talara tar seeps, northwestern Peru - Campbell, Kenneth E. Jr. (Kenneth Eugene), 1943 - (1973)

Pleistocene birds of the palearctic : a catalogue - Nuttall Ornithological Club. (Nuttall Ornithological Club, 1998)

Popular official guide to the New York zoological park - New York Zoological Society. (New York zoological Society, 1915)

Popular official guide to the New York Zoological Park - New York Zoological Society. (New York Zoological Society, 1913)

Popular Science Review (1874)

Postilla - Peabody Museum of Natural History. (Peabody Museum of Natural History, 1968)

Postilla - Peabody Museum of Natural History. (Peabody Museum of Natural History, 1991)

Principles of animal biology - Shull, A. Franklin (Aaron Franklin), 1881 -1961 (McGraw-Hill, 1920)

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Proceedings - Dorset Natural History; Archaeological Society.

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Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1922)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1976)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1977)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1978)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1979)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1984)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1985)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1986)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1987)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1995)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 2002)

Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1915)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 2017)

Proceedings of the Entomological Society of British Columbia - Entomological Society of British Columbia (Entomological Society of British Columbia, 1948)

Proceedings of the Entomological Society of Washington - Entomological Society of Washington (Entomological Society of Washington, 1956)

Proceedings of the Entomological Society of Washington - Entomological Society of Washington (Entomological Society of Washington, 1968)

Proceedings of the Entomological Society of Washington - Entomological Society of Washington (Entomological Society of Washington, 1974)

Proceedings of the Entomological Society of Washington - Entomological Society of Washington (Entomological Society of Washington, 1985)

Proceedings of the Entomological Society of Washington - Entomological Society of Washington (Entomological Society of Washington, 1986)

Proceedings of the Entomological Society of Washington - Entomological Society of Washington (Entomological Society of Washington, 1994)

Proceedings of the Entomological Society of Washington - Entomological Society of Washington (Entomological Society of Washington, 2003)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1891)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1901)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1951)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1955)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1960)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1962)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1980)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1982)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1990)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1991)

Proceedings of the Linnaean Society of New York ... - Linnaean Society of New York (Linnaean Society of New York, 1933)

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Proceedings of the Linnean Society of New South Wales - Linnean Society of New South Wales. (Linnean Society of New South Wales, 1967)