Philippine birds - Du Pont, John E. (John Eleuthère), 1938 -2010 ([Delaware Museum of Natural History], 1971)

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

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Preliminary biological and cultural resources inventory and environmental evaluation of the proposed operational base sites in Coyote Spring Valley and the Milford-Beryl Area - United States. Bureau of Land Management. (Fugro Northwest, 1981)

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

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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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Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1958)

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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)

The Proceedings of the Iowa Academy of Science - Iowa Academy of Science (The Academy, 1909)

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Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1909)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1917)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1919)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1926)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1927)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1930)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1931)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1932)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1938)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1940)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1942)

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qing zang gao yuan yan jiu heng duan shan kao cha zhuan ji 2 - Zhongguo ke xue yuan. Qing zang gao yuan zong he ke xue kao cha dui (bei jing ke xue ji shu chu ban she, 1986)

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Reisen in Nord-ost-Afrika : Schilderungen aus dem gebiete der Beni Amer und Habab nebst zoologischen skizzen und einem führer für jagdreisende - Heuglin, Theodor von, 1824 -1876 (G. Westermann, 1877)

Relación informativa referente à los congresos de la Sociedad alemana de zoologia en Kiel, Internacional de geología en San Petersburgo y de Naturalistas y médicos alemanes en Brunsvique en el año 1897 - Berg, Cárlos, 1843 -1902 (Impr. de M. Biedma é hijo, 1899)

Relatorio : Anno de 1919-1922 - Museu Nacional (Brazil) (Imprensa Nacional, 1923)

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Report of the Secretary of the Smithsonian Institution and financial report of the Executive Committee of the Board of Regents for the year ending June 30 ... - Smithsonian Institution (Smithsonian Institution, 1961)

Report of the Secretary of the Smithsonian Institution and financial report of the Executive Committee of the Board of Regents for the year ending June 30 ... - Smithsonian Institution (Smithsonian Institution, 1962)

Report of the Secretary of the Smithsonian Institution and financial report of the Executive Committee of the Board of Regents for the year ending June 30 ... - Smithsonian Institution (Smithsonian Institution, 1963)

Report of the Secretary of the Smithsonian Institution and financial report of the Executive Committee of the Board of Regents for the year ending June 30 ... - Smithsonian Institution (Smithsonian Institution, 1964)

Report of the state zoölogist - Herrick, C. L. (Clarence Luther), 1858 -1904 (1892)

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Report on the birds of Pennsylvania. With special reference to the food-habits, based on over four thousand stomach examinations - Pennsylvania. Ornithologist. (E. K. Meyers, state printer, 1890)

Report on the birds of Pennsylvania : with special reference to the food habits, based on over four thousand stomach examinations - Warren, Benjamin Harry, 1858 -1926 (E.K. Meyers, State Printer, 1890)

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Report upon ornithological specimens collected in the years 1871, 1872, and 1873 - Geographical Surveys West of the 100th Meridian (U.S.) (Govt. Print. Off, 1874)

Report upon United States Geographical surveys west of the one hundredth meridian - Geographical Surveys West of the 100th Meridian (U.S.) (G.P.O, 1875)

Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean - Baird, Spencer Fullerton, 1823 -1887 (A.O.P. Nicholson, Printer [etc.], 1858)

Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean - Baird, Spencer Fullerton, 1823 -1887 (A.O.P. Nicholson, Printer [etc.], 1853)

Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean - Baird, Spencer Fullerton, 1823 -1887 (A.O.P. Nicholson, Printer [etc.], 1859)

Resultate der Wissenschaftlichen Erforschung des Balatonsees - Hungary. Földmm̋uvelésügyi Minisztérium. (E. Hölzel, 1897)

Results of the Archbold Expeditions. No. 73, Birds of the Archbold Biological Station, Lake Placid, Florida - Amadon, Dean (American Museum of Natural History, 1956)