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	1.	Local cover image Image from Google Jackets	Aquatic pests on irrigation systems : identification guide/ N E Otto by Otto,N E T R Bartley; J S Thullen; J M Evans & D W Cunningham Series: Water resources technical publication Material type: Text; Format: print ; Literary form: Not fiction Publication details: Denver : U.S. Dept. of the Interior, Water and Power Resources Service, 1965 Availability: Items available for loan: Irrigation Research Institute Library - Punjab Irrigation Department (1)Call number: 632.7 AQU 1965. Place hold Save to lists
	2.	Local cover image Image from Google Jackets	Aquatic weed control studies. / N. E. (Norman E) Otto, by Otto, N. E. (Norman E) Bartley, T. R Series: A water resource technical publication Edition: Research report No. 2 Material type: Text; Format: print ; Literary form: Not fiction Publication details: U.S. G.P.O., Washington: U.S. Dept. of the Interior, Bureau of Reclamation, 1966 Availability: Items available for loan: Irrigation Research Institute Library - Punjab Irrigation Department (1)Call number: 658 AQU 1966. Place hold Save to lists