| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:281972 |
| Date | January 1951 |
| Creators | Walker, Vera |
| Publisher | Durham University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://etheses.dur.ac.uk/1423/ |
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