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Smithsonian Institution, 1891
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Smithsonian Institution, 1896
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Smithsonian Institution, 1897
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Smithsonian Institution, 1898
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Smithsonian Institution, 1897
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Smithsonian Institution, 1895
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SAGE Publications, 2014
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Smithsonian Institution, 1907
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Smithsonian Institution, 1927
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Smithsonian Institution, 1923
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Smithsonian Institution, 1922
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Smithsonian Institution, 1912
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Smithsonian Institution, 1911
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Smithsonian Institution, 1910
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Smithsonian Institution, 1911
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Smithsonian Institution, 1910
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Smithsonian Institution, 1907
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Smithsonian Institution, 1909
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Smithsonian Institution, 1909
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Ovid Technologies (Wolters Kluwer Health), 1986