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New York [u.a.]: McGraw-Hill, 1961
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Cambridge, Mass.: Harvard Univ. Pr., 1948
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New York: Knopf, 1948
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New York: Knopf, 1947
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New York [u.a.]: McGraw-Hill, 1943
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New York, NY [u.a.]: McGraw-Hill, 1957
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New York: Knopf, 1949
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New York: Norton, 1943
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New York [u.a.]: McGraw-Hill, 1945
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New York [u.a.]: McGraw-Hill, 1947
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New York: Norton, 1941
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New York [u.a.]: MacGraw-Hill, 1941
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New York [u.a.]: McGraw-Hill, 1945
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s.l.: Harvard University Press, 1948 ; 1948
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s.l.: Harvard University Press, 1952 ; 1952
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s.l.: Harvard University Press, 1949 ; 1949
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s.l.: Harvard University Press, 1948 ; 1948
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s.l.: Harvard University Press, 1956 ; 1956
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s.l.: Harvard University Press, 1960 ; 1960
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JSTOR, 1963