...Fisher of the Biological Surveypredicted that the woodcock and wood-duck would both become extinctunless better protected... 
William T. Hornaday 「Our Vanishing Wild Life」
...
—These magnificent monsters present a perplexing problem, which I am inclined to believe can be satisfactorily solved by the Biological Survey only in short periods, say of three or four years each...
William T. Hornaday 「Our Vanishing Wild Life」
...Henshaw, Chief of the Biological Survey...
William T. Hornaday 「Our Vanishing Wild Life」
...In a letter to the Biological Survey, under date of April 3, 1896, Mr...
A. R. (Arthur Robert) Harding 「Wolf and Coyote Trapping」
...A biological survey of North Dakota...
E. Raymond Hall 「A Synopsis of the North American Lagomorpha」
...A Biological Reconnaissance of the Base of the Alaska Peninsula...
Frank M. Chapman 「Color Key to North American Birds」
...Economic Ornithology [= Biological Survey]...
Frank M. Chapman 「Color Key to North American Birds」
...38, Biological Survey...
Frank M. Chapman 「Color Key to North American Birds」
...Results of a Biological Reconnaissance of Idaho,south of latitude 45° and east of the thirty-eighth Meridian made during thesummer of 1890...
Frank M. Chapman 「Color Key to North American Birds」
...Never in the history of my investigations has the logic of things been more insistent; never has it directed me with greater certainty towards a magnificent biological theory...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
...Results of a biological reconnaissance of the Yukon River region...
Rollin H. Baker 「Mammals taken Along the Alaska Highway」
...A biological investigation of theThelon Game Sanctuary...
Francis Harper 「The Barren Ground Caribou of Keewatin」
...A biological exploration of Banks and Victoria Islands...
Francis Harper 「The Barren Ground Caribou of Keewatin」
...Synopsis of biological data on the chum salmon, Oncorhynchus keta(Walbaum) 1792...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
...Report of the Bureau of Commercial Fisheries Biological Laboratory,Beaufort, N...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
...The specimensconcerned are in the Biological Surveys Collection of the U...
E. Raymond Hall 「Comments on the Taxonomy and Geographic Distribution of Some North American Marsupials, Insectivores and Carnivores」
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