The hard-rock resources of the country around Caerphilly, South Wales description of parts of 1:50,000 geological sheets 249 and 263
Adlam, K. A. McL.
Harrison, D. J.
Wild, J. B. L.
British Geological Survey.
London HMSO
1984
At head of title: British Geological Survey
With a folding map in a pocket at the end
Sandstone