Geology of the country around Cadair Idris : memoir for 1:50 000 geological sheet 149 (England and Wales) /
Pratt, W. T.
Woodhall, D. G.
Howells, M. F.(Malcolm Fletcher)
British Geological Survey.
London : HMSO,
1995.
At head of title : British Geological Survey.
Includes bibliographical references and indexes.
Geology