Walker, Arthur L. 1899-
How to use adding and calculating machines / Arthur L. Walker, J. Kenneth Roach, J. Marshall Hanna. - 4th ed. - New York : Gregg Division, McGraw-Hill, c1979. - 218 p. : ill.
0070678251
91035060
Calculators--Problems, exercises, etc.
How to use adding and calculating machines / Arthur L. Walker, J. Kenneth Roach, J. Marshall Hanna. - 4th ed. - New York : Gregg Division, McGraw-Hill, c1979. - 218 p. : ill.
0070678251
91035060
Calculators--Problems, exercises, etc.