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|All Authors / Contributors:||
|Notes:||Reprint of the 1912 ed., issued in series: Teachers College, Columbia University. Contributions to education, no. 51.
Originally presented as the author's thesis, Columbia.
|Description:||vii, 129 pages illustrations 22 cm|
|Series Title:||Columbia University.; Teachers College.; Contributions to education|
|Responsibility:||New York, Teachers College, Columbia University, 1912.|