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Operation and Maintenance Working Group. Meeting (1994: Geneva, Switzerland) ,  World Health Organization. Division of Operational Support in Environmental Health ,  [Proceedings of the Operation and Maintenance Working Group Meeting, Geneva, 31 May - 3 June 1994]

Operation and Maintenance Working Group. Meeting (1994: Geneva, Switzerland) ,  World Health Organization. Division of Operational Support in Environmental Health ,  [Proceedings of the Operation and Maintenance Working Group Meeting, Geneva, 31 May - 3 June 1994]

Water Supply and Sanitation Collaborative Council Working Group on Promotion of Sanitation ,  Simpson-Hébert, Mayling ,  Wood, Sara ,  World Health Organization. Division of Operational Support in Environmental Health ,  [La promotion de l' assainissement / Groupe de travail sur la promotion de l' assainissement du Conseil de concertation pour l' approvisionnement en eau et l' assainissement; édité par Mayling Simpson-Hérbert et Sara Wood]

Water Supply and Sanitation Collaborative Council Working Group on Promotion of Sanitation ,  Simpson-Hébert, Mayling ,  Wood, Sara ,  World Health Organization. Division of Operational Support in Environmental Health ,  [La promotion de l' assainissement / Groupe de travail sur la promotion de l' assainissement du Conseil de concertation pour l' approvisionnement en eau et l' assainissement; édité par Mayling Simpson-Hérbert et Sara Wood]