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1. National Water Supply and Sanitation Council. Human Resources Development Department. Assessors' manual. Water treatment processes (CBMT REF NO WT) Draft/Dec 95 (1995)
   National Water Supply and Sanitation Council; Human Resources Development Department
2. National Water Supply and Sanitation Council. Human Resources Development Department. Guidelines for external verifiers (1995)
   National Water Supply and Sanitation Council; Human Resources Development Department
3. National Water Supply and Sanitation Council. Human Resources Development Department. Guidelines for internal verifiers (1995)
   National Water Supply and Sanitation Council; Human Resources Development Department