1.
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New York and London, Harper & brothers, 1936.
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2.
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3.
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4.
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Durham, N.C., Duke University Press, 1967.
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5.
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Durham, N.C. Duke University Press, 1965.
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6.
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Athens, University of Georgia Press [1960]
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7.
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Durham, N.C., Duke University Press, 1972.
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8.
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New York, AMS Press, Inc., 1966, c1941.
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