004490000a22001330004500003000900000005001700009110007700026245009700103264002900200490004800229300001000277041000800287650002000295PH-MaWHO20241108112100.0 aInternational Hydrological Decade-WHO Working Group on Quality of Water. aWater quality surveys : a guide for the collection and interpretation of water quality data. aParis : bUnesco,c1978. a(Studies and reports in hydrology ; no. 23) a350p. aeng aWaterxAnalysis