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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