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2. An investigation of two formal operational schemata in adolescents in the ISCS Classrooms of three selected teachers. Unpublished doctoral thesis, The University of Iowa, Iowa City, Iowa, 1972.
3. & The growth of logical thinking. New York: Basic Books, 1958.
4. Intermediate Science Curriculum Study. Probing the natural world. Silver Burdett Company, 1970.
5. & Handbook for the application of the science curriculum assessment system. Tallahassee, Florida: Florida State University, 1968.