| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:290920 |
| Date | January 1981 |
| Creators | Usher, D. M. |
| Publisher | University of York |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://etheses.whiterose.ac.uk/9780/ |
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