TY  - BOOK
AU  - Brueckner,Leo J.
AU  - Grossnickle,Foster E.
AU  - Reckzeh,John
TI  - Developing mathematical understandings in the upper grades
AV  - QA11 .B848
U1  - 510 
PY  - 1957///
CY  - Philadelphia
PB  - Winston
KW  - Mathematics
KW  - Study and teaching (Secondary)
ER  -