Thesis (Ph. D.)--University of Minnesota, 1923. / Vita. Published also as Teachers college, Columbia university. Contributions to education no. 149. Bibliography: p. 84.
| Identifer | oai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/551292466 |
| Date | January 1924 |
| Creators | Powers, Samuel Ralph, |
| Publisher | New York city, Teachers college, Columbia University, |
| Source Sets | OCLC |
| Language | English |
| Detected Language | English |
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