Ecological grazing management : a development alternative for brittle environments - the case of Namibia
1989
Otzen, Uwe |
Agriculture
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 |
The soil/root system in relation to Brazilian agriculture
1981
Russel, R. Scott |
Igue, Kozen |
Mehta, Y. R. |
Colonizacion y destruccion de bosques en Panama
1984
Moreno, Stanley Heckadon |
McKay, Alberto |