1. Biological uniformity and disease epidemics;Adams;Bioscience,1971
2. The Agrarian Question and Reformism in Latin America;de Janvry,1981
3. Ecofarming in the tropics — characteristics and potentialities;Egger;Plant Res. Dev.,1981
4. Adapting varieties for intercropping systems in the tropics;Francis,1976
5. Small farm development;Harwood,1979