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Seager, M., Boesveld, M. & Hadidi, H.A.F.El, 1994. Mission on user involvement and hygiene education in water supply and sanitation in the Fayoum Governorate, 9-23 April 1994 Draft., Delft, The Netherlands: IRC. Available at: https://es.ircwash.org/sites/default/files/824EG-17402.PDF.