Regenerative farming systems : a workshop held in Washington, DC 10-11 December 1985
1985
Agriculture
Chena shifting cultivation and land transformation in the dry zone of Sri Lanka
1988
Gelbert, Michel |
Ecological grazing management : a development alternative for brittle environments - the case of Namibia
1989
Otzen, Uwe |
Pragas, praguicidas e a crise ambiental : problemas e soluçoes
1979
Paschoal, Adilson D. |
Cultivating Knowledge : genetic diversity, farmer experimentation and crop research
1993
Boef, Walter de |
Prospects for wild life conservation in the Gambia
1973
Parker, I. S. C. (Ian S. C.) |
Münchner Alpenschutzkonferenz der Friedrich-Ebert-Stiftung
1987
Nahe-Mann, Brigitte |