Issued also as thesis (PH. D.) Columbia university. / Bibliography: p. 170-181.
| Identifer | oai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/636980942 |
| Date | January 1932 |
| Creators | Hughes, William Leonard, |
| Publisher | New York city, Teachers college, Columbia university, |
| Source Sets | OCLC |
| Language | English |
| Detected Language | English |
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