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Olten; Freiburg i. Br.: Walter, 1968
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New York; Düsseldorf [u.a.]: McGraw-Hill, 1972
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New York [u.a.]: Holt, Rinehart and Winston, 1963
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New York : [Published by order of the Trustees of the American Museum of Natural History], 1946
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New Haven, Conn: Human Relations Area Files, Inc, 2004
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New Haven, Conn: Human Relations Area Files, Inc, 2008
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JSTOR, 1931
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JSTOR, 1943
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Oxford University Press (OUP), 1978