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- catalog contributor b2255330.
- catalog contributor b2255331.
- catalog created "1967.".
- catalog date "1967".
- catalog date "1967.".
- catalog dateCopyrighted "1967.".
- catalog description "Thesis (Ed. D.)--Harvard Graduate School of Education, 1967.".
- catalog extent "ix, 183 leaves :".
- catalog issued "1967".
- catalog issued "1967.".
- catalog language "eng".
- catalog subject "Child labor.".
- catalog subject "Child psychology.".
- catalog title "A psychological study of working boys / Kenneth Gerald Marsden.".
- catalog type "text".