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.
Page 85 in Extension Service Circular 544, Review of Extension Research, January through December 1961, U.S. Department of Agriculture, Washington, D.C. Summary of Special Report 6, Office of Extension Studies, Cornell University, Ithaca, New York. 1962. 45 pages.
Pages 79-80 in Extension Circular 532, Review of Extension Research, January through December 1959, U.S. Department of Agriculture, Washington, D.C. Summary of research, Communications Research Center, Michigan State University, East Lansing. 1958. 57 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.
