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Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb. "The statistical study which appears in the appendix and in chapter four was published in practically the same form in the Quarterly journal of the University of North Dakota, April, 1914. It is an abstract of a more extended study which was prepared as a doctor's thesis ... University of North Dakota."--Author's pref "General references": p. 145-146
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