TY  - BOOK
AU  - Dunfee,Maxine
AU  - Sagl,Helen L.
TI  - Social studies through problem solving: a challenge to elementary school teachers 
AV  - LB1584 D85
PY  - 1966///
CY  - New York, E.U.A.
PB  - Holt Rinehart & Winston
N1  - Bibliografia : p. 337-349
ER  -