Biodiversity Heritage Library
By "Thullen, J. S. "
Aquatic pests on irrigation systems : identification guide /
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.
Holding Institution: U.S. Government Printing Office (archive.org)