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Machette M.N, Marchetti D.W, Thompson R.A, Kirkham R.M.  2007.  Chapter B--Field Trip Day 2: Quaternary Geology of Lake Alamosa and the Costilla Plain, southern Colorado. Quaternary geology of the San Luis Basis, southern Colorado and Northern New Mexico--Rocky Mountain Section Friends of the Pleistocene Guidebook: U. S. Geological Survey Open-File Report 2007-1193.