TY  - BOOK
AU  - Spencer,Peter Lincoln
AU  - Brydegaard,Marguerite
TI  - Building mathematical competence in the elementary school
AV  - QA135 .S75 1952
U1  - 372.7 
PY  - 1952///
CY  - New York
PB  - Holt, Rinehart and Winston
KW  - Arithmetic
KW  - Study and teaching (Elementary)
KW  - Local
N1  - Published in 1952 under title: Building mathematical concepts in the elementary school; Includes bibliographies
ER  -