Water pollution.
Tripathi, A.K.
Water pollution. A.K. Tripathi and S.N. Pandey. - New Delhi. APH Publishing corporation. 2009 - ix, 326p. : ill. ; hbk
9788131304716
Water -- Pollution.
TD420.T7 2009
Water pollution. A.K. Tripathi and S.N. Pandey. - New Delhi. APH Publishing corporation. 2009 - ix, 326p. : ill. ; hbk
9788131304716
Water -- Pollution.
TD420.T7 2009