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This page will be up-dated from time to time as errors are noticed or as short items of new information become availale. For example, further references to other relevant sources will be included.

The author would be glad to receive from readers material that would be suitable for this page or for a future revision of a section that is inadequately treated in this first edition. Such items may be sent by e-mail to g.a.wilkins@exeter.ac.uk.