Contains 2 fold. maps.
At head of title: Institute of Geological Sciences. List of maps p.105-106.
Previous ed., by R.W. Pocock and T.H. Whitehead, 1948.
The Welsh borderland by J. R. Earp. ISBN 0118801228. Published by H.M.S.O. in 1971. Publication and catalogue information, links to buy online and reader comments.