TY  - BOOK
AU  - Albrecht, Hartmut
AU  - Bergmann, Herbert & Others
TI  - Agricultural extension, vol. II: Basic concepts and methods
SN  - 388085405X
U1  - 631.31 A 151 A 
PY  - 1990///
CY  - New Delhi
PB  - New Age
KW  - Extension
ER  -