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  1. 1979-02-01 170 pages, illustrated
  2. 1983-01-01 50 pages, illustrated
  3. 1979-01-01 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. 2010-10-20 Experiences promoting use of moringa in Tanzania