TY  - BOOK
AU  - Haas,Kenneth B.
AU  - Packer,Harry Q.
TI  - Preparation and use of audio-visual aids
PY  - 1955///
CY  - Englewood Cliffs, N.J.
PB  - Prentice-Hall
KW  - Audio-visual education
N1  - Includes index
ER  -