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|All Authors / Contributors:||
Howard D Langford
|Notes:||Reprint of the 1931 ed., issued in series: Teachers College, Columbia University. Contributions to education, no. 509.
Originally presented as the author's thesis, Columbia.
|Description:||vi, 212 pages 22 cm|
|Series Title:||Columbia University.; Teachers College.; Contributions to education|
|Responsibility:||by Howard D. Langford. New York, Bureau of Publications, Teachers College, Columbia University, 1931.|