TY  - BOOK
AU  - Walker,Arthur L.
AU  - Roach,J.K.
AU  - Hanna,J.M.
TI  - How to use adding and calculating machines: ten-key, full-key, rotary, key-driven 
U1  - 681.145 23
PY  - 1960///
CY  - New York
PB  - Gregg Pub. Division
KW  - Calculators
ER  -