Pacific coast avifauna - Cooper Ornithological Club. (Cooper Ornithological Club, 1902)

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Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1918)

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

Part I. Palæontology - Hall, James, 1811 -1898 (Govt. print. off, 1877)

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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)

Pennsylvania bird life; a manual of the birds of Pennsylvania; treating especially of their food, from examinations of several thousand stomachs, made during all seasons of the year, with descriptions of the birds, their nests, eggs and habits - Warren, Benjamin Harry, 1858 -1926 (Penn'a., Pub by the author, 1892)

Pesticides monitoring journal - United States. Chemical Information Division. (Technical Services Division, Office of Pesticide Programs, U.S. Environmental Protection Agency, 1981)

Pesticides monitoring journal - United States. Chemical Information Division. (Technical Services Division, Office of Pesticide Programs, U.S. Environmental Protection Agency, 1975)

Pesticides monitoring journal - United States. Chemical Information Division. (Technical Services Division, Office of Pesticide Programs, U.S. Environmental Protection Agency, 1967)

Pfarrer P. Blasius Hanf als Ornitholog. Dargestellt vorzüglich auf Grundlage der Schriften desselben - Schaffer, Alexander. (Im Selbstverlag der Benediktiner-Abtei, 1904)

Phase I, wildlife impact assessment and summary of previous mitigation related to hydroelectric projects in Montana : volume two (A), Clark Fork projects, Thompson Falls Dam – operator, Montana Power Company - Olsen, Arnold. (Bonneville Power Administration, Division of Fish and Wildlife, 1984)

Phase I, wildlife impact assessment and summary of previous mitigation related to hydroelectric projects in Montana : volume two (B), Clark Fork River projects, Cabinet Gorge and Noxon Rapids Dams –operator, Washington Water Power Company - Olsen, Arnold. (Bonneville Power Administration, Division of Fish and Wildlife, 1984)

The Phoenix - Jennings, Michael C. (M.C. Jennings, 1996)

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)

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

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A popular handbook of the birds of Canada and the United States - Nuttall, Thomas, 1786 -1859 (Musson Book Co, 1907)

A popular handbook of the birds of the United States and Canada - Nuttall, Thomas, 1786 -1859 (Little, Brown, 1903)

A popular handbook of the birds of the United States and Canada - Nuttall, Thomas, 1786 -1859 (Little, Brown, 1919)

A popular handbook of the birds of the United States and Canada - Nuttall, Thomas, 1786 -1859 (Little, Brown, 1905)

A popular handbook of the ornithology of eastern North America - Nuttall, Thomas, 1786 -1859 (Little, Brown, and Company, 1896)

A popular handbook of the ornithology of the United States and Canada, based on Nuttall's Manual - Nuttall, Thomas, 1786 -1859 (Little, Brown, and Company, 1891)

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

Potential wildlife-highway interactions at select mile-markers along Montana Department of Transportation routes an ArcView GIS analysis - Irby, Lynn R. (Fish and Wildlife Management Program, Montana State University, 2001)

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)

A preliminary catalog of the birds of Missouri - Widmann, Otto (Academy of Science of St. Louis, 1907)

A preliminary catalog of the birds of Missouri - Widmann, Otto (Academy of Sciences of St. Louis?, 1907)

A preliminary list of the birds of Wayne County, Ohio - Oberholser, Harry C. (Harry Church), 1870 -1963 (Westbote Co., State Printers, 1896)

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The proceedings and transactions of the Nova Scotian Institute of Science, Halifax, Nova Scotia - Nova Scotian Institute of Science. (Printed for the Institute by W. McNab, 1895)

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Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1937)

Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1938)

Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1940)

Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1971)

Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1975)

Proceedings of the Bournemouth Natural Science Society - Bournemouth Natural Science Society (1979)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1935)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1939)

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)

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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)

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Proceedings of the Essex Institute - Essex Institute. (Essex Institute Press, 1848)

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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.], 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.], 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.], 1888)