TY  - BOOK
AU  - Walker,Arthur L.
AU  - Roach,J.Kenneth
AU  - Hanna,J.Marshall
TI  - How to use adding and calculating machines : : ten-key, rotary, key -driven / 
U1  - Q 651.264 WAL 
PY  - 1960///
CY  - New York : 
PB  - McGraw-Hill, 
KW  - Calculators
ER  -