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An experimental study to determine the relative difficulty of the elementary number combinations in addition and multiplication ...Holloway, Harry Vance, January 1915 (has links)
Thesis (Ph. D.)--University of Pennsylvania, 1914. / "Bibliography and references": p. 100-102.
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An experimental study to determine the relative difficulty of the elementary number combinations in addition and multiplication ...Holloway, Harry Vance, January 1915 (has links)
Thesis (Ph. D.)--University of Pennsylvania, 1914. / "Bibliography and references": p. 100-102.
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