Page 65 in Review of Extension Research, January through December 1957. Summary of a survey for Agricultural Extension, Texas Agricultural College, College Station. 1957. 14 pages.
Page 64-65 in Review of Extension Research, January through December 1957. Survey for Agricultural Extension, University of California, Berkeley. 1957. 8 pages.
Pages 53-54 in Review of Extension Research, January through December 1957. Information Sheet 540, Mississippi Agricultural Experiment Station, Mississippi State University, State College. 1956.