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Wachs, Theodore D. – Child Develop, 1969
Research supported by grant MH-12627 from the National Institute of Mental Health, and based on a PhD dissertation submitted to George Peabody College.
Descriptors: Age Differences, Children, Intelligence Differences, Intelligence Quotient
Rothenberg, Barbara B. – Child Develop, 1969
Research supported by a grant from the Carnegie Corporation.
Descriptors: Age Differences, Cognitive Development, Conservation (Concept), Instructional Materials