TY  - BOOK
AU  - Tocquet, Robert
TI  - Magic of numbers : lightning calculators and their secrets, how to do mental arithmetic, animal calculators
U1  - 512.7 
PY  - 1957///
CY  - London
PB  - Elik Books
KW  - Number theory
N1  - Tr. by Denis Weaver
ER  -