Page 85 in Extension Circular 532, Review of Extension Research, January through December 1959, U.S. Department of Agriculture, Washington, D.C. Brief description of an update of a document of the same title, Journal Series 2047, Missouri Agricultural Experiment Station, University of Missouri, Columbia. 1959. 20 pages.
Page 69 in Extension Circular 534, Review of Extension Research, January through December 1960, U.S. Department of Agriculture, Washington, D.C. Brief description of a thesis of this title for the master of science degree in agricultural extension, University of Tennessee, Knoxville. 1960. 199 pages.
