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an ideal system for hygienic final disposal of excreta in the absence of a central sewerage system. ...
After defecation, a few litres of water must be poured, or thrown, into the bowl in order to flush t...
Lecture notes for medical students
Water Quality is an important deteminant of health and wel-being as unsafe water leads to a variey o...
Good book of OC
Manual of clinical microbiology
