1. Beans technology under research and farmer management and implications for adoption in Serenje District of Central Province, Zambia;Bezuneh,1990
2. Environment and Development in Africa: Selected Case Studies;Blackwell,1991
3. Reconciling Sustainability with Productivity Growth: Opportunities for Collaboration Among U.S. Universities: A Workshop, Co-sponsored by Unviersity of Florida and Cornell University;CGIAR,1993
4. Sustainable agriculture;Crosson;Q. Newslett. Resources Future,1992