TY  - BOOK
AU  - Haas,Kenneth Brooks
AU  - Packer,Harry Q.
TI  - Preparation and use of audio-visual aids
U1  - 371.335 
PY  - 1950///
CY  - New York
PB  - Prentice-Hall
KW  - Audiovisual education
KW  - Local
ER  -