Collins, J.H. (1912); Observations of the West of England Mining Region; 753 pages
Dewey, Henry (1923); BGS - Mineral Resources of GB (c1920s) Vol XXVII - Copper Ores of Devon and Cornwall; 92 pages
Joseph Yelloly Watson (1843); Compendium of British Mining, with Statistical Notices… & Glossary; 97 pages
Various (1920); BGS - Mineral Resources of GB (c1920s) Vols XIV, XV, XVI, XVII, XVIII - Fireclay; Arsenic & Antimony Ores; Refactory Materials, Lead & Zinc of Scotland, Rock-Salt and Brine (5 books); 777 pages
