TY  - BOOK
AU  - Hanna, Lavone .A
AU  - Hagaman, Neva (Ed)
AU  - Hanna, Lavone .A
TI  - Unit teaching in the elementary school: Social studies and related sciences
U1  - 372.83 
PY  - 1963///
CY  - New York
PB  - Holt, Rinehart and Winston
ER  -