TY  - BK
AU  - Olmos B.,G.
TI  - Los materiales audiovisuales en la comunicacion agricola
U1  - 630.0208 
PY  - 1970///
CY  - Montecillo, Tex. (Mexico)
PB  - Colegio de Postgraduados, 
KW  - Audiovisual aids
KW  - Films
KW  - Information flow
KW  - Instruments
KW  - Mass media
KW  - Photography
KW  - Teaching materials
N1  - Illustrations, bibliography
ER  -