TY  - BOOK
AU  - Erickson, Carlton W.H.
TI  - Administering audio-visual services
U1  - 371.335068 21st ed.
PY  - 1959///
CY  - New York
PB  - The Macmillan Company
KW  - Audio visual aid
KW  - Audio visual material
N1  - Index: p. 461-79
ER  -