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Mexico. Muir, John M. (1936). Geology of the Tampico Region Mexico. Tulsa: American Association of Petroleum Geologists. xix + 280pp + 5 folded maps. American Association of Petroleum Geologists.
Cadel, Henry M. (1907). ‘Some Old Mexican Volcanoes’, reprint from The Scottish Geological Magazine, v.23, pp181-312 + 12 plates. HB. Scottish Geographical Society.