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Dept. of Psychology. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1974 .V32. Source: Dissertation Abstracts International, Volume: 62-13, Section: A. Thesis (Ph.D.)--University of Windsor (Canada), 1974.
Vanden Heuvel, Kees J., "The development of concrete operational structures as a function of structural equilibration in normal and mentally retarded populations." (1974). Electronic Theses and Dissertations. 3834.