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- 39031387 contributor B952958.
- 39031387 created "1939.".
- 39031387 date "1939".
- 39031387 date "1939.".
- 39031387 dateCopyrighted "1939.".
- 39031387 description "Bibliography: p. 151-160.".
- 39031387 description "Issued also as thesis (Ph. D.) Columbia University.".
- 39031387 extent "x, 179 p.".
- 39031387 isPartOf "Teachers college, Columbia university. Contributions to education ; no. 769.".
- 39031387 issued "1939".
- 39031387 issued "1939.".
- 39031387 language "eng".
- 39031387 publisher "New York, Teachers College, Columbia University,".
- 39031387 subject "510.712".
- 39031387 subject "Ability.".
- 39031387 subject "Children with disabilities Education.".
- 39031387 subject "Mathematics Study and teaching.".
- 39031387 subject "QA11 .M25 1939a".
- 39031387 title "The relative difficulty of certain topics in mathematics for slow-moving ninth grade pupils, by Virgil S. Mallory.".
- 39031387 type "text".