Conservation for sustainable agricultural development in the Sudano-Sahelian region of Africa : technical papers from a consulutation, Banjul, The Gambia, 27 May - 2 June 1989
Complete Title:
Conservation for sustainable agricultural development in the Sudano-Sahelian region of Africa : technical papers from a consulutation, Banjul, The Gambia, 27 May - 2 June 1989