TY  - BOOK
ED  -  National Council of Teachers of Mathematics
ED  -  National Council of Teachers of Mathematics.
TI  -  Mathematical challenges for the middle grades
U1  -  510.8 
PY  - 1964///
CY  -  Reston, VA : 
PB  -  National Council of Teachers of Mathematics, 
KW  -  Mathematics
KW  -  Problems, exercises, etc
N1  -  Includes bibliographical references
ER  -