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by Ray Hamill Simpson
AMS Press 1972 Contributions to education no. 748
Available at 12 libraries
Ray H. Simpson
Longmans, Green 1953
Available at 18 libraries
by Ray H. Simpson and E.S. Brown
Bureau of Research and Service, College of Education 1952 University of Illinois bulletin v. 49, no. 75
Available at 1 libraries
Bureau of Publications, Teachers College, Columbia University 1938