Pages 71-72 in Extension Circular 541, Review of Extension Research, January through December 1961, U.S. Department of Agriculture, Washington, D.C. Summary of thesis forthe master of science degree, North Dakota State University, Fargo. 1961. 104 pages.
Pages 70-71 in Extension Circular 541, Review of Extension Research, January through December 1961, U.S. Department of Agriculture, Washington, D.C. Summary of Federal Extension Service ER&T-141, U.S. Department of Agriculture, Washington, D.C.. 1961. 5 pages.
