00643cam a22001817a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093110004400102245015900146260007500305300003100380650002600411650002400437CHAP20220329141929.0980807d1990    us a    r     00110 eng d  a75886  a76858  a86449  cCHAP2 aWater and Sanitation for Health Project10aLessons learned from the wash project :bten years of water and sanitation experience in developing countriesc/by Water and Sanitation for Health Project  aArlington, Virginia :bWater and Sanitation for Health Project,c1990.  a100 p. :bilus. ; gráfs.14aAguaxAbastecimiento.14aAguaxPurificacion.