Identification of knapweeds and starthistles in the Pacific Northwest / [by Cindy Talbott Roché and Ben F. Roché].
Imprint
[Olympia, Wash.] : Washington State University Cooperative Extension ; [Corvallis, Or.] : Oregon State University Extension Service ; [Moscow, Idaho] : University of Idaho Cooperative Extension System ; [Washington D.C.] : U.S. Dept. of Agriculture, [1993]
