Geology of the country around Harlech memoir for 1: 50 000 geological sheet 135 with part of sheet 149, (England and Wales) /
Allen, P. M.
Jackson, A. A.,Ph.D.
Dunkley, P. N.
British Geological Survey.
London H.M.S.O.
1985
At head of title: British Geological Survey
Includes index
Geology