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	1.	No cover image available Transport of sewage sludgel / William F. Ettlich 1977 by Ettlich, William F United States. Environmental Protection Agency. Office of Research and Monitoring Series: Environmental protection technology series Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington : U.S. Govt. Print. Off., 1977 Availability: Items available for loan: National Library of India (1)Call number: U.S 628.364 Et 76. Place hold Request article Save to lists
	2.	No cover image available A comparison of oxidation ditch plants to competing for secondary and advanced treatment of municipal wastes / William F. Ettlich 1978 by Ettlich, William F United States. Environmental Protection Agency. Office of Research and Monitoring Series: Environmental protection technology series Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington : U.S. Govt. Print. Off., 1978 Availability: Items available for loan: National Library of India (1)Call number: U.S 363.728 Et 761 a. Place hold Request article Save to lists

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