TY  - BOOK
AU  - Heddens,James W.
TI  - Today's mathematics: a guide to concepts and methods in elementary school mathematics
SN  - 057418600X
AV  - QA135.5 .H42 1974
U1  - 372.7/3 
PY  - 1974///
CY  - Palo Alto, Calif.
PB  - Science Research Associates
KW  - Mathematics
KW  - Study and teaching (Elementary)
KW  - Local
N1  - 920901; Includes bibliographies and index
ER  -