TY  - BOOK
AU  - Cutler, Ann 
AU  - McShane, Rudolph
TI  - Trachtenberg speed system of basic mathematics
SN  - 9780285629165
U1  - 513.92 C973t 
PY  - 1960///
CY  - New Delhi
PB  - Rupa & Co
KW  - Mental arithmetic
KW  - Arithmetic
ER  -