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Jehan Zeb, M.Aslam, Shahid Ahmad and Aamir Kabir, 1999. Low-cost Sand Filter For Domestic and Stockwater Use . Pakistan Journal of Biological Sciences, 2: 1415-1418.
DOI: 10.3923/pjbs.1999.1415.1418
URL: https://scialert.net/abstract/?doi=pjbs.1999.1415.1418
DOI: 10.3923/pjbs.1999.1415.1418
URL: https://scialert.net/abstract/?doi=pjbs.1999.1415.1418