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Title:	Tertiary volcanic stratigraphy in the Powderhorn-Black Canyon region, Gunnison and Montrose Counties, Colorado : nomenclature, lithology, and stratigraphic relations of a sequence of ash-flow tuffs, flows, and breccia
Authors:	Olson, J. C.
Imprint:	Washington, D.C.: United States Department of the Interior, Geological Survey, 1968

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