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- catalog contributor b4366947.
- catalog created "1969.".
- catalog date "1969".
- catalog date "1969.".
- catalog dateCopyrighted "1969.".
- catalog extent "15, [9] ℓ.".
- catalog issued "1969".
- catalog issued "1969.".
- catalog language "eng".
- catalog publisher "Cambrige, Mass., Harvard Univ., Center for Research and Development on Educational Differences,".
- catalog subject "Education, Preschool.".
- catalog subject "Interpersonal relations.".
- catalog subject "Sociometry.".
- catalog title "Pre-school peer relationships.".
- catalog type "text".