An experimental study to determine the relative difficulty of the elementary number combinations in addition and multiplication
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An experimental study to determine the relative difficulty of the elementary number combinations in addition and multiplication
State Gazette Pub. Co., 1915
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"A thesis presented to the Faculty of the Graduate School of the University of Pennsylvania in partial fulfilment of the requirements for the degree of Doctor of Philosophy by Harry Vance Holloway, June, 1914" -- on t.p.