TY  - GEN
AU  -   Hass, Kenneth B.
TI  - Preparation and use of audio visual AIDS
U1  - 371.335 
PY  - 1955///
CY  - New York
PB  - Prentice Hall
KW  -   Audiovisual materials
KW  -   Teaching, Aids and devices
N1  -   Includes index
ER  -