Thesis (Ph. D.)--University of Pennsylvania, 1909. / Published also as Bulletin of the U.S. Bureau of labor statistics, whole no. 229.
| Identifer | oai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/590202872 |
| Date | January 1918 |
| Creators | Paterson, Robert G. |
| Publisher | [Washington, D.C.] |
| Source Sets | OCLC |
| Language | English |
| Detected Language | English |
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