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U.S. Copyright Renewals, 1950 January - June · Chapter 66Wentworth-Smith Mathematical Series
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Fundamentals of practical mathematics, by George Wentworth, David Eugene Smith and Herbert Druery Harper. © 5Apr22, A661560. R56626, 3Jan50, Maude Simpson Wentworth (W), Eva May Luse Smith (W) & Herbert Druery Harper (A)
Machine-shop mathematics, be George Wentworth, David Eugene Smith and Herbert Druery Harper. © 6May22, A674463. R56629, 3Jan50, Maude Simpson Wentworth (W), Eva May Luse Smith (W) & Herbert Druery Harper (A)