(Lesson 2. Plant Species Selection continued) Barnhart, S. and Sternweis, L. 1994. CRP-10, Converting to Pasture or Hay-Evaluating Current Vegetation, Iowa State University Extension, Ames, IA. Barnhart, S. and Sternweis, L. 1994. CRP-11, Converting CRP Land to Pasture-Managing Weeds and Fertility, Iowa State University Extension, Ames, IA. Barnhart, S. and Sternweis, L. 1994. CRP-13, Converting