@INBOOK {LEGG:2007, title = {Targeting agricultural research for development in Tanzania: an example of the use of GIS for ex ante impact assessment at IITA}, author = {Legg, C. }, year = {2007}, type = {Assessing the impact of agricultural research on rural livelihoods: achievements, gaps, and options}, pages = {61--74}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, isbn = {978 131 321 8}, note = {Assessing the impact of Agricultural Research on rural livelihoods: achievements, gaps, and options: approaches, challenges, and results during the twenty-sixth conference of the International Association of Agricultural Economics, 12-18 August 2006, Gold Coast Convention and Exhibition Center, Brisbane, Australia}, }