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By "Bartley, T. R. "
Aquatic pests on irrigation systems : identification guide / by N. E. Otto, T. R. Bartley and J. S. Thullen ; illustrated by D. W. Cunningham and J. M. Evans.
By: Otto, N. E. - Bartley, T. R. - Cunningham, D. W. - Evans, J. M. - Thullen, J. S.
Edition: 2nd ed.
Publication info: Denver :For sale by the Supt. of Docs., U.S. G.P.O. ;1980.
Contributed by: U.S. Government Printing Office (archive.org)