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2. Biological Science Curriculum Study. Biological science: Molecules to man, Revised Edition, Boston, MA: Houghton Mifflin Company, 1968a.
3. Biological Sciences Curriculum Study. Biological science: Molecules to man achievement test 1, Form BIT. Boston, MA: Houghton Mifflin Company, 1968b.
4. The Karplus Islands Puzzle: Does it measure piagetian operations?
5. Human characteristics and school learning. New York, NY: McGraw-Hill Book Company, 1976.