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Current results range from 1925 to 1945

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Ornithologist Granville P. Ashcraft holding a bird specimen collected by a team of U.S.C. scientists during their exploration of the Gulf of Lower California, Los Angeles, February 21, 1940

Ornithologist Granville P. Ashcraft with bird specimen collected by a team of U.S.C. scientists during their exploration of the Gulf of Lower California, Los Angeles, February 21, 1940

Ornithologist Granville P. Ashcraft with specimens collected by a team of U.S.C. scientists during their exploration of the Gulf of Lower California, Los Angeles, February 21, 1940

John P. McNabb tests carbon monoxide levels, Los Angeles, 1936

John P. McNabb tests carbon monoxide levels, Los Angeles, 1936


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