009430000a22002050004500003000900000005001700009562001800026110007500044710005700119264004900176700002100225245019800246300001000444500021600454041000800670650001700678650001500695650001600710040001100726PH-MaWHO20241108112541.0  aWHO/CWS/90.15  aWorld Health Organization. Community Water Supply and Sanitation Unit.  aDeutsche Gesellschaft fnr Technische Zusammenarbeit.  aGeneva : bWorld Health Organization,c1990.  aMcPherson, H. J.  aProceedings of the Meeting of the Operation and Maintenance Working Group, Geneva, 19-22 June 1990 : Volume 2: Case studies on operation and maintenance of rural and urban water supply systems.  a131p.  aOrganized with the support of IRC, International Water and Sanitation Centre, Netherlands, WASH (Water and Sanitation Project, USA, WB/UNDP (UNDP/World Bank Water and Sanitation Programme) ; co-sponsored by GTZ.  aeng  aWater supply  aSanitation  aMaintenance  aWHOLIS