Pages 77-78 in Extension Service Circular 544, Review of Extension Research, January through December 1961, U.S. Department of Agriculture, Washington, D.C. Summary of thesis for the master of science, Michigan State University, East Lansing. 1962. 205 pages.
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.