SSudanSudande Leonard BerryMateriasPoorEconomic conditionsSocial conditionsEdiciones (1)Sudan (1983)International Development Program, Clark University · inglésMás obras de Leonard BerryHuman adjustment to agricultural drought in TanzaniaJohn L. Balderston papersEssentials of geography and development
SStudies of soil erosion and sedimentation in TanzaniaStudies of soil erosion and sedimentation in Tanzania