| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:454018 |
| Date | January 1971 |
| Creators | Drumm, M. J. |
| Publisher | Aston University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://publications.aston.ac.uk/21113/ |
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