Geology of the Lampeter district‐a brief explanation of the geological map. Sheet Explanation of the British Geological Survey. 1:50 000 Sheet 195 Lampeter (England and Wales). J. R. Davies, D. I. Schofield, T. H. Sheppard, R. A. Waters, M. Williams and D. Wilson (eds). Publisher: British Geological Survey, Keyworth, 2006 ISBN: 978‐0‐85272‐565‐8.. Geology of the Llangranog district‐a brief explanation of the geological map. Sheet Explanation of the British Geological Survey. 1:50 000 Sheet 194 Llangranog (England and Wales). J. R. Davies, T. H. Sheppard, R. A. Waters and D. Wilson (eds). Publisher: British Geological Survey, Keyworth, 2006 ISBN: 978‐0‐85272‐566‐5