National seminar on setting priorities for research in the land use continuum in Vietnam, Hoa Binh, September 9-13, 1991 Author(s) Sargent, Caroline Palmer, John Morrison, Elaine
Problems of land degradation in Commonwealth Africa : a study of the scope of Commonwealth action Author(s) Milner, C. Douglas, M. G.
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
