该书已不再出版。
The lectures reproduced in this book were delivered as part of an introductory course in agricultural extension at the University of Sri Lanka in 1974.
114 pages
出版物详细信息
- 已出版: 1978
- 出版者: Agricultural Development Council,
- Dewey Decimal: 630.715
- ECHO 图书馆: 630.715 MOS