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- 31013234 contributor B771737.
- 31013234 created "1931.".
- 31013234 date "1931".
- 31013234 date "1931.".
- 31013234 dateCopyrighted "1931.".
- 31013234 extent "viii, 52 p.".
- 31013234 isPartOf "Contributions to education ; no. 454".
- 31013234 issued "1931".
- 31013234 issued "1931.".
- 31013234 language "eng".
- 31013234 publisher "New York : Teachers College, Columbia University,".
- 31013234 spatial "United States.".
- 31013234 subject "374/.873".
- 31013234 subject "Child labor United States.".
- 31013234 subject "Educational tests and measurements.".
- 31013234 subject "Evening and continuation schools United States.".
- 31013234 subject "LC5251 .G6 1931a".
- 31013234 title "Variability in continuation school populations : a study of the significance of differences in the proportions of child workers / by Anthony M. Goldberger.".
- 31013234 type "text".