Essential portion of Thesis (Ph. D.)--University of Pennsylvania, 1937. / Reproduced from type-written copy. "The study has been confined to the changes that took place in the northeastern part of the United States."--Pref. The essential portion consists of chapter IX. The complete dissertation on microfilm in the Library of the University of Pennsylvania. Bibliography: p. 28-33.
| Identifer | oai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/610120069 |
| Date | January 1945 |
| Creators | Jacoby, Harold Stanley, |
| Publisher | Philadelphia, |
| Source Sets | OCLC |
| Language | English |
| Detected Language | English |
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