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- 12019839 contributor B489764.
- 12019839 created "[1912]".
- 12019839 date "1912".
- 12019839 date "[1912]".
- 12019839 dateCopyrighted "[1912]".
- 12019839 extent "12 p.".
- 12019839 isPartOf "[Russell Sage foundation. Dept. of child hygiene. Pamphlets] no. 111".
- 12019839 issued "1912".
- 12019839 issued "[1912]".
- 12019839 language "eng".
- 12019839 publisher "New York City".
- 12019839 spatial "United States".
- 12019839 subject "Children, Backward.".
- 12019839 subject "Education United States Finance.".
- 12019839 subject "Education United States Statistics.".
- 12019839 subject "LC4031 .A8".
- 12019839 subject "Slow learning children.".
- 12019839 title "The money cost of repetition versus the money saving through acceleration, by Leonard P. Ayres ...".
- 12019839 type "text".