More suggestions and sources
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Burrows, Colin J. Julius Haast in the Southern Alps. Christchurch: Canterbury University Press, 2005.
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Cotton, C. A. Geomorphology: an introduction to the study of landforms. 7th ed., rev. Christchurch: Whitcombe & Tombs, 1958.
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Cotton, C. A. Volcanoes as landscape forms. Christchurch: Whitcombe & Tombs, 1944.
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Grapes, Rodney. ‘Sir Charles Cotton, 1885–1970.’ In Eminent Victorians, edited by Vincent O’Sullivan, 109–125. Wellington: Stout Research Centre, 2000.
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Hochstetter, Ferdinand von. New Zealand: its physical geography, geology, and natural history. Christchurch: Kiwi, 1997 (originally published 1867).