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- catalog contributor b1361206.
- catalog created "1979.".
- catalog date "1979".
- catalog date "1979.".
- catalog dateCopyrighted "1979.".
- catalog description "Bibliography: leaves 69-81.".
- catalog description "Qualifying paper--Harvard Graduate School of Education.".
- catalog extent "82 leaves ;".
- catalog issued "1979".
- catalog issued "1979.".
- catalog language "eng".
- catalog subject "BF311 .P44".
- catalog subject "Cognition in children.".
- catalog subject "Knowledge, Theory of.".
- catalog subject "Piaget, Jean, 1896-1980.".
- catalog title "Piaget's stages : conceptual and methodologcal problems in verifying their existence / submitted by Erin Phelps.".
- catalog type "text".