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- catalog contributor b5440000.
- catalog date "1971".
- catalog description "Thesis (A.B., Honors)--Harvard University, 1971.".
- catalog issued "1971".
- catalog language "eng".
- catalog title "Jean Piaget and the mentally retarded; a study of the conservation of length and area with normal and retarded children, by David M. Blocker.".
- catalog type "text".