1.
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Minneapolis : University of Minnesota Press, 1930.
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2.
|
Cambridge, Mass., Harvard university press, 1940.
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3.
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New York, Gordian Press, 1968.
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4.
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Minneapolis, The University of Minnesota Press, 1930.
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5.
|
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6.
|
New York, Gordian Press, 1967.
|
7.
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New York, Barnes & Noble [1968]
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