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Page 8 in Extension Circular 534, Review of Extension Research, January through December 1960, U.S. Department of Agriculture, Washington, D.C. Summary of Research Bulletin 850, Ohio Agricultural Experiment Station, Ohio State University,Columbus. 1960. 38 pages.
Page 64-65 in Review of Extension Research, January through December 1957. Survey for Agricultural Extension, University of California, Berkeley. 1957. 8 pages.
Page 60 in Extension Circular 541, Review of Extension Research, January through December 1961, U.S. Department of Agriculture, Washington, D.C. Summary of Ohio Agricultural Experiment Station Research Bulletin 890 of this title, Ohio State University, Wooster. 1961. 18 pages.
Pages 54-55 in Review of Extension Research, January through December 1957. Summary of research for Agricultural Extension, College of Agriculture, University of Illinois, Urbana. 1957. 7 pp.
Pages 74-75 in Extension Circular 532, Review of Extension Research, January through December 1959, U.S. Department of Agriculture, Washington, D.C. Summary of research report, Extension Service, Michigan State University, E. Lansing. 1959. 17 pages.
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