| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:505407 |
| Date | January 1964 |
| Creators | Varker, William John |
| Publisher | University of Sheffield |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://etheses.whiterose.ac.uk/6129/ |
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