TY  - BOOK
ED  - United States. 
TI  - Aids for evaluators of mathematics textbooks : : report / 
U1  - 371.33 UNI 
PY  - 1965///
CY  - Washington D. C. : 
PB  - National Council of Teachers of Mathematics, 
KW  - Mathematics
KW  - Study and teaching
KW  - United States
KW  -  Aids and devic es
KW  - Aids and devic es
ER  -