Thesis--University of Pennsylvania. / "Reprint from Proceedings of the Delaware County Institute of Science, x, 3." "Bibliography of most important sources": p. 58-60.
| Identifer | oai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/575892798 |
| Date | January 1947 |
| Creators | Park, Mary Cathryne, |
| Publisher | Philadelphia, |
| Source Sets | OCLC |
| Language | English |
| Detected Language | English |
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