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Judd, J.W. (1888). Volcanoes; what they are and what they teach. London: Kegan Paul,. Kegan Paul.
Howe, J.A. 1910. The Geology of Building Stones. London: Edward Arnold, 455pp. + 8pp publisher’s adverts. 1st edition. Edward Arnold.
Viljoen, M.J. and Reimold, W.U. (1999). An Introduction to South Africa’s Geological and Mining Heritage. Mintek.