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المساهمون: Brewster, William, 1851-1919
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المساهمون: Birdseye, Clarence, 1886-1956
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المساهمون: United States. Bureau of Biological Survey.
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المساهمون: Cooke, Wells W. (Wells Woodbridge), 1858-1916, Fuertes, Louis Agassiz, 1874-1927, Kennard, Frederic H. (Frederic Hedge), 1865-1937, Shiras, George, 1859-1942, National Geographic Society (U.S.)
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المساهمون: Cooke, Wells W. (Wells Woodbridge), 1858-1916, Fuertes, Louis Agassiz, 1874-1927, Kennard, Frederic H. (Frederic Hedge), 1865-1937, Shiras, George, 1859-1942, National Geographic Society (U.S.)
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