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	1.	Water Technology : Text An Introduction for Environmental Scientists and Engineers / N. F. Gray by Gray, N. F [Author] Edition: 3rd ed.,Revised Material type: Text Publication details: Amsterdam : Elsevier, c2010 Availability: Items available for loan: UOE Main Library (3)Call number: TD345 .G73 2010, ... Place hold Save to lists
	2.	Activated sludge : theory and practice / N.F. Gray. by Gray, N. F Series: Oxford science publications Material type: Text Publication details: Oxford ; New York : Oxford University Press, 1990 Online resources: Publisher description Table of contents only Availability: Items available for loan: UOE Main Library (2)Call number: TD756 .G73 1990, ... Place hold Save to lists

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