Biosphere reserves
1979
Franklin, Jerry F. |
Krugman, Stanley L. |
Krugman, Stanley L.
Tree improvement and silvo-pastoral management in sahelian and north sudanian Africa : problems, needs and research proposals
Cossalter, C. (Christian) |
Iyamabo, D. E. |
Krugman, Stanley L. |
Fugalli, O. |