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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 found in Vermont - Perkins, George H. (George Henry), 1844 -1933 (Wynkoop Hallenbeck Crawford Co, 1901)

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

A preliminary report on the biology of Harding County, northwestern South Dakota - Visher, Stephen Sargent, 1887 -1967 (State Publishing Co, 1914)

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Price list - George Parker & Sons. (George Parker & Sons, 1911)

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Principles of animal ecology - Allee, W. C. (Warder Clyde), 1885 -1955 (Saunders Co, 1949)

Problems of modern science, a series of lectures delivered at King's College (University of London) - Dendy, Arthur, 1865 -1925 (Harrap, 1922)

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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 (1946)

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

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Proceedings of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1868)

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