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.
Otto, N. E.
Bartley, T. R.
Cunningham, D. W.
Evans, J. M.
Thullen, J. S.
For sale by the Supt. of Docs., U.S. G.P.O. ;
QH96 .O88 1980
Water resources technical publication.