Pages 82-83 in Extension Circular 541, Review of Extension Research, January through December 1961, U.S. Department of Agriculture, Washington, D.C. Summary of research, Baltimore City Extension Service, Baltimore, Maryland. 1961. 26 pages.
Pages 81-82 in Extension Circular 541, Review of Extension Research, January through December 1961, U.S. Department of Agriculture, Washington, D.C. Summary of research, Agricultural Experiment Station, University of Minnesota, St. Paul. 1961. 12 pages.
