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1.	Image from Google Jackets	Biology of wastewater treatment by Gray N. F Edition: 2nd Material type: Text; Format: print ; Literary form: Not fiction Publication details: London ; Imperial College Press ; 2004 Availability: Items available for loan: Government College University, Lahore (1)Call number: 628.351 GRA. Place hold Save to lists
2.	Image from Google Jackets	Water technology by Gray, N. F Nick Gray Edition: 2nd ed Material type: Text; Format: print ; Literary form: Not fiction Publication details: New York : Butterworth-Heinemann Availability: Items available for loan: Lahore College for Women University (1)Call number: 628.1 GRA-W 2005 21180. Place hold Save to lists
3.	Image from Google Jackets	Water Technology; An Introduction for Environmental Scientists and Engineers by Gray, N. F Ali Riaz ( Ed. ) Edition: 3 Material type: Text Publication details: London Elsevier 2010 Availability: Items available for loan: Quaid-e-Azam Library, Lahore (1). Place hold Save to lists

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