TY  - BOOK
AU  - Lesh, Richard A.
AU  - Landau,Marsha
TI  - Acquisition of mathematics concepts and processes
T2  - Developmental Psychology Series
SN  - 012444220X (alk. paper)
AV  - QA135.5 .A27 1983
PY  - 1983///
CY  - New York
PB  - Academic Pressb
KW  - Mathematics - - Study and teaching (Elementary)
KW  - Psychological aspects
N1  - beight case studies; Includes bibliographical references and index
ER  -