TY  - BOOK
T1  - Children discover arithmetic an  introduction to structural arithmetic.
A1  - Stern, Catherine 1894-
LA  - English
PP  - New York
PB  - Harper
YR  - 1949
UL  - https://ds.mainlib.upd.edu.ph/Record/UP-99796217603633537
OP  - 295
CN  - QA 135 S84
KW  - Arithmetic : Study and teaching.
ER  -