Page 77-78 in Extension Circular 532, Review of Extension Research, January through December 1959, U.S. Department of Agriculture, Washington, D.C. Summary of thesis for master of science degree, Michigan State University, East Lansing. 1959. 117 pages.
Page 77 in Extension Circular 532, Review of Extension Research, January through December 1959, U.S. Department of Agriculture, Washington, D.C. Summary of research report by the Information Division, Agricultural Research Service, U.S. Department of Agriculture, Washington, D.C. 1959. 46 pages.
