Pages 77-78 in Extension Circular 521, Review of Extension Research, January through December 1958, U.S. Department of Agriculture, Washington, D.C. Summary of a research project report, Louisiana State University, Baton Rouge. 1958. 59 pages.
Pages 75-77 in Extension Circular 521, Review of Extension Research, January through December 1958, U.S. Department of Agriculture, Washington, D.C. Summary of the thesis for a Master of Science degree in agricultural economics, Michigan State University, East Lansing. 1958. 138 pages.
Page 78 in Extension Circular 521, Review of Extension Research, January through December 1958, U.S. Department of Agriculture, Washington, D.C. Summary of research reported in Missouri Agricultural Experiment Station Bulletin 702, University of Missouri, Columbia. 1958. 16 pages.