Thesis (Ph. D.)--University of California, 1919. / Cover-title. United States Department of agriculture. Bulletin no. 934. Contribution from the Bureau of plant industry. Washington, D. C. Professional paper, June 16, 1921, with a special thesis t.-p., dated December, 1919, attached to the cover. Thesis approval page inserted (folded). "Literature cited": p. 91-99. Also available in digital form on the Internet Archive Web site.
| Identifer | oai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/16653602 |
| Date | January 1921 |
| Creators | Hartley, Carl, |
| Publisher | Washington : U.S. Dept. of Agriculture, |
| Source Sets | OCLC |
| Language | English |
| Detected Language | English |
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