TY  - BOOK
AU  - Fosnot, Catherine Twomey
AU  - Dolk Maarten
TI  - Young Mathematicians At Work: Constructing Number Sense, Addition and Subtraction
SN  - 032500353
AV  - QA 135.5 .F6 2001
PY  - 2001///
CY  - Portsmouth, NH
PB  - Heinemann
KW  - Mathematics-study and teaching [Elementary]
ER  -