Ornitologia italiana : opera postuma - Savi, Paul, 1798 -1871 (Successori Le Monnier, 1873)

Ornitologia toscana; ossia, Descrizione e storia degli uccelli che trovansi nella Toscana, con l'aggiunta della descrizioni di tutti gli altri proprj al rimanente d'Italia - Savi, Paul, 1798 -1871 (Dalla tipografia Nistri, 1827)

L'Ornitologo Ticinese ossia manuale descrittivo gli Uccelli di stazione e di passaggio nel Cantone Ticino, &c - Riva, Antonio. (1865)

Osteologia avium, or, A sketch of the osteology of birds - Brooks, Vincent, 1815? -1885 (Published by R. Hobson, Wellington, Salop, 1869)

Osteology of the waterfowl - Woolfenden, Glen Everett, 1930 - (1960)

Our country's birds and how to know them. A guide to all the birds of Great Britain - Gordon, W. J. (Simpkin, Marshall, Hamilton, Kent, 1892)

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 resident birds and how to know them - Elms, E. F. M. (T. Butterworth, 1921)

Outlines of general zoology - Baird, Spencer Fullerton, 1823 -1887 (Rudolph Garrigue, 1851)

Oversigt over det Kongelige Danske videnskabernes selskabs forhandlinger = Bulletin de l'Académie royale des sciences et des lettres de Danemark - Kongelige Danske videnskabernes selskab. (A.F. Høst, 1854)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 2004)

Pacific seabirds : a publication of the Pacific Seabird Group - Pacific Seabird Group. (The Group, 2006)

Palaeontological memoirs and notes of H. Falconer, with a biographical sketch of the author. Vol. I, II - Falconer, Hugh, 1808 -1865 (1868)

Palaeontology - Palaeontological Association (Palaeontological Association, 1988)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1888)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1918)

Parasitology - British Society for Parasitology. (Cambridge University Press, 1916)

P.D. Skaar's Montana bird distribution - Montana Natural Heritage Program. (Montana Natural Heritage Program, 2012)

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)

Philosophical transactions of the Royal Society of London - Royal Society (Great Britain) (Royal Society of London, 1849)

The Phoenix - Jennings, Michael C. (M.C. Jennings, 1992)

The Phoenix - Jennings, Michael C. (M.C. Jennings, 2005)

The pictorial museum of animated nature ... - Knight, Charles, 1791 -1873 (C. Knight, 1844)

The pictorial museum of animated nature - Knight, Charles, 1791 -1873 (C. Cox, 1844)

Planches coloriees des oiseaux de la Belgique et de leurs oeufs - Dubois, Ch. F. (Charles Frédéric), 1804 -1867 (C. Muquardt, 1854)

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

A pocket-book of British birds - Elms, E. F. M. (West, Newman & co. [etc.], 1906)

Popular British ornithology : containing a familiar and technical description of the birds of the British Isles - Gosse, Philip Henry, 1810 -1888 (Reeve and co, 1853)

Popular British ornithology : containing a familiar and technical description of the birds of the British Isles - Gosse, Philip Henry, 1810 -1888 (Reeve, Benham, and Reeve, 1849)

A popular history of British birds' eggs - Laishley, Richard. (L. Reeve, 1858)

Popular natural history - Wood, J. G. (John George), 1827 -1889 (Porter & Coates, 1885)

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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, 1911)

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

Popular Science Review (1866)

Popular Scripture zoology, containing a familiar history of the animals mentioned in the Bible - Catlow, Maria E. (Reeve, 1852)

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

Postilla - Peabody Museum of Natural History. (Peabody Museum of Natural History, 1999)

The poultry book : a treatise on breeding and general management of domestic fowls : with numerous original descriptions, and portraits from life - Bennett, John C. (Phillips, Sampson, 1856)

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A practical handbook of British birds - Witherby, H. F. (Harry Forbes), 1873 -1944 (Witherby, 1921)

A practical handbook of British birds - Witherby, H. F. (Harry Forbes), 1873 -1944 (Witherby, 1924)

Pre-historic times - Lubbock, John, Sir, 1834 -1913 (Williams and Norgate, 1865)

Pre-historic times, as illustrated by ancient remains and the manners and customs of modern savages - Lubbock, John, Sir, 1834 -1913 (D. Appleton and company, 1892)

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Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1933)

Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1936)

Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1953)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1944)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1949)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1954)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1959)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1964)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1970)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1988)

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Proceedings of the Cleveland Naturalists' Field Club - Cleveland Naturalists' Field Club. (1903)

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Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1929)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1938)

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.], 1991)

Proceedings of the Linnaean Society of New York ... - Linnaean Society of New York (Linnaean Society of New York, 1941)

Proceedings of the Linnaean Society of New York ... - Linnaean Society of New York (Linnaean Society of New York, 1954)

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Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1882)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1900)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1929)

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