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Herbert Druery Harper

Wentworth Smith Mathematical Series; Machine-Shop Mathematics
Wentworth Smith Mathematical Series; Machine-Shop Mathematics
David Eugene Smith, George Wentworth, Herbert Druery Harper
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Machine-Shop Mathematics
Machine-Shop Mathematics
David Eugene Smith, George Wentworth, Herbert Druery Harper
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Fundamentals of practical mathematics
Fundamentals of practical mathematics
David Eugene Smith, George Wentworth, Herbert Druery Harper
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