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Southeast England. Gregory, J. W. (1922). Evolution of the Essex Rivers and of the Lower Thames. Colchester: Benham, 68pp. Paperback. Benham.
Stanford, K.S. (1925). ‘The Geology of the North-East Land (Spitzbergen)’ extract from the QJGS. Geological Society of London.
Thordarson, Thor and Hoskuldsson, Armann (2002). Iceland in Classic Geology in Europe series, no 3. Terra.