Dear Mr. Donaldson,
There was an excellent (unpublished) PhD thesis 'Geology, geochemistry and
economic significance of the celestite deposits of Yate' by Christopher J.
Brown, (Dept. of Geology) Imperial College, London, 1983. You should be
able to see a copy at IC or via the University of London holdings at the
Senate House.
Regards,
Richard Howarth
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