TY  - BOOK
AU  - Swain, Robert L.
AU  - 
ED  - 
ED  - 
ED  - 
ED  - 
SN  - 2
PY  - 1957///46
CY  - New York
PB  - Rinehart
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Foundations.;Study and teaching
KW  - Number concept.;Arithmetic;Arithmetic
N1  - 5
ER  -