Thesis (Ph. D.)--Columbia University, 1931. / Vita. Published also as Teachers college, Columbia university, Contributions to education, no. 495. Bibliography at end of chapters I and II.
| Identifer | oai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/300955806 |
| Date | January 1931 |
| Creators | Hahn, Julia Letheld, |
| Publisher | New York city, Teachers college, Columbia University, |
| Source Sets | OCLC |
| Language | English |
| Detected Language | English |
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