Page 8 in Grace Gallup and Lucinda Crile, Bibliography on Extension Research, November 1943-1948. Library List No. 48. USDA Library, U.S. Department of Agriculture, Washington, D.C. July 1949. Digest of a master's thesis, Washington University, Washington, D.C. Report of an MS thesis, Agricultural Extension, Agriculture College, Kansas State College, Manhattan. 1947. 54 pages..