TY  - BOOK
AU  - Obaidur,Rahman M.
ED  - University Microfilms International
TI  - Effectiveness of instructional materials in teaching social studies in grades IV, V, and VI in schools of Dacca, Pakistan
U1  - 371.3063 
PY  - 1968///
CY  - Colorado
PB  - Colorado State College
KW  - Social sciences
ER  -