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- catalog alternative "Difficulty, A study of the nature of.".
- catalog contributor b4426520.
- catalog created "1926.".
- catalog date "1926".
- catalog date "1926.".
- catalog dateCopyrighted "1926.".
- catalog description "Bibliography: p. 38-39.".
- catalog extent "v, 39 p. ;".
- catalog isPartOf "Contributions to education, no. 206.".
- catalog issued "1926".
- catalog issued "1926.".
- catalog language "eng".
- catalog publisher "New York city : Teachers college, Columbia university,".
- catalog subject "Educational psychology.".
- catalog subject "Educational tests and measurements.".
- catalog subject "Intelligence tests.".
- catalog subject "Psychological tests.".
- catalog title "A study of the nature of difficulty / by Jacob S. Orleans.".
- catalog title "Difficulty, A study of the nature of.".
- catalog type "text".