TY  - BOOK
AU  -  Moon, Parry Hiram,
TI  -  The abacus: its history, its design, its possibilities in the mo dern world 
U1  -  513.028 
PY  - 1971///
CY  -  New York
PB  -  Gordon and Breach Science Publishers
KW  -  Abacus
N1  -  Includes bibliographical references
ER  -