Vidyasyahadri ...

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1. Biology of wastewater treatment / by Gray, N.F. Publication: Oxford : Oxford University Press , 1989 . x,410p ; Date: 1989 Availability: Items available: Kuvempu University Library (1),

2. Water technology: an introduction for environmental scientists and engineers / by Gray, N.F. Publication: Oxford : Butterworth-Heinemann , 2005 . xii,242p. ; Date: 2005 Availability: Items available: Kuvempu University Library (1),

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