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	1.		Elements of environmental engineering / K. N. Duggal by Duggal, K. N Material type: Text; Format: print ; Literary form: Not fiction Publication details: New Delhi : S. Chand & Company, 1966 Availability: Items available for loan: Reference Collection (1)Call number: 628 DUG. Place hold
	2.		Elements of environmental engineering / K. N. Duggal by Duggal, K. N Publication details: New Delhi : S. Chand & Company, 1966 Availability: No items available.

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