Petrell, Dennis E2022-07-262022-07-261967-12https://hdl.handle.net/11299/229752A Thesis Presented to the Faculty of the Department of Education and Psychology, University of Minnesota Duluth, by Dennis E. Petrell, In Partial Fulfillment of the Requirements for the Degree of Master of Arts, December 1967.enUniversity of Minnesota DuluthPlan Bs (project-based master's degrees)Master of ArtsMaster of Arts in Educational PsychologyDivision of Education and PsychologyDepartment of PsychologyScholarly Text or Essay