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Extension education and rural development : Volume 1 : international experience in communication & innovation / ed. by Bruce R. Crouch and Shankariah Chamala.
- Wiley,
- cop. 1981.
- Chicester, England :
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Tropical agricultural hydrology : watershed management and land use / ed. by R. Lal and E.W. Russell.
- Wiley,
- cop. 1981.
- Chichester [etc.] :