| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:459006 |
| Date | January 1978 |
| Creators | Hewitt, George R. |
| Publisher | Open University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://oro.open.ac.uk/57004/ |
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