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1. Water surveys and designs: explains survey techniques and gives standard designs with average costs on water supply structures * (2006)
   Nissen-Petersen, Erik; Wanjihia, Catherine W.; Danish International Development Agency (DANIDA); ASAL Consultants
2. Report on the visit to Sri Lanka 11-25 March 1993. Dr P.R. Lewis and Mr P. Hargreaves [Faculty of Technology, The Open University] (1993)
   Open University (OU); Lewis, P.R.; Hargreaves, P.