TY  - BOOK
AU  - Van de Walle,John A.
TI  - Elementary school mathematics: teaching developmentally 
SN  - 080130203X
AV  - QA135.5 .V34 1990
U1  - 372.7 20
PY  - 1990///
CY  - New York
PB  - Longman
KW  - Mathematics
KW  - Study and teaching (Elementary)
N1  - Includes index; Bibliography: p. 452-457
ER  -