TY  - BOOK
AU  - Weaver, Gilbert G.
AU  - Bollinger, Elroy W.
TI  - Visual Aids: Their Construction and Use
U1  - 371.335 
PY  - 1949///
CY  - New Jersey
PB  - D. Van Nostrand Company
KW  - Education
KW  - Social sciences
KW  - Audiovisual aids
KW  - Educational technology
ER  -