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2. Elementary Science Study, Attribute Games and Problems, (Newton, Mass.: Educational Development Corporation, 1966).
3. Science Curriculum Improvement Study, Material Objects, (Boston, Mass.: D. C. Heath and Company, 1966).
4. Lockard, (ed.), Seventh Report of the International Clearinghouse on Science and Mathematics Curricular Developments 1970, (College Park, Md.: American Association for the Advancement of Science and the Science Teaching Center, University of Maryland, 1970.)
5. The learning of object and pattern discriminations by children.