TY  - BOOK
AU  - Stern,Catherine
AU  - Stern,Margaret B.
TI  - Children discover arithmetic: an introduction to structural arithmetic
AV  - QA135 .S84 1971
U1  - 372.7/2 
PY  - 1971///]
CY  - New York
PB  - Harper & Row
KW  - Arithmetic
KW  - Study and teaching
KW  - Local
N1  - Bibliography: p. 401-404
ER  -