TY  - BOOK
AU  - Green,George F.
TI  - Elementary school mathematics: activities and materials 
SN  - 0669845825
AV  - QA135.5 .G675
U1  - 372.7 
PY  - 1974///]
CY  - Lexington, Mass.
PB  - Heath
KW  - Mathematics
KW  - Study and teaching (Elementary)
N1  - Includes bibliographies and index
UR  - http://www.archive.org/details/elementaryschool00gree
UR  - http://www.openlibrary.org/books/OL5424792M
ER  -