1. 01-02-1979 170 pages, illustrated
  2. 01-01-1983 50 pages, illustrated
  3. 01-01-1979 This definitive work provides step-by-step guidance in the techniques of digging and constructing a well, including the principles of groundwater storage, the actual construction, the materials required, and details of additional sources of information. 253 pages, illustrated, photos
  4. 20-10-2010 Experiences promoting use of moringa in Tanzania