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2. The Cardiff District;Anderson;Geol. Assoc. Exc. Guide,1971
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4. Geological Excursion Guide to the Glasgow District;Bassett;Geol. Soc. Glasgow.,1958
5. Bathurst, R.G.C. et al. 1965. Geology around the University Towns. Exc. Guide, No. 6, Geol. Assoc. (Liverpool).