TY  - BOOK
AU  - HASS
TI  - PREPARATION AND USE OF AUNIO-VISUAL AIDS
U1  - GN371.33H111P3 
PY  - 1955///
CY  - NEW YORK
PB  - PRENTICE-HALL, INC
KW  - PREPARATION AND USE OF AUNIO-VISUAL AIDS
ER  -