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by P. Kendall, P.A DiPersio, J.N. Sofos, Colorado State University Extension, Bulletin no. 575A, 2004, 8 1/2 x 11, paper bound, 20 pages
by Liz Manes, Colorado State University Extension, XCM-189, 1995, 8 1/2 x 11 booklet, 10 pages.
by T. Bauder, R. Waskom, Colorado State University Extension water quality and resources specialists, 4 fact sheets