TY  - BOOK
AU  - Sutherland,Mary Ethel
TI  - One-step problem patterns and their relation to problem solving in arithmetic
SN  - 0404559255 (ed. 1972)
AV  - QA135.5 .S93 1947
U1  - 372.7/2/044 
PY  - 1947///
CY  - New York
PB  - Columbia University
KW  - Arithmetic
KW  - Study and teaching
KW  - Local
KW  - Problems, exercises, etc
ER  -