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Report of the United States Geological Survey of the Territories
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"This Atlas is composed of two series of maps: the first, of four sheets, on a scale of twelve miles to one inch, each covering the whole State of Colorado; the second, of twelve sheets (six topographical and six geological, of identical areas,) on a scale of four miles to one inch, each sheet embracing two and one-half degrees of Longitude and one and one-quarter degrees of Latitude, the whole presenting the results of the field work of 1873, '74, '75, and '76, covering the entire State of Colorado and adjacent portions of Utah, Arizona, and New Mexico. ... The work of Primary Triangulation was carried on by J. T. Gardner, from 1873 to the Autumn of 1875, and was completed by A. D. Wilson. The preparation of the colored sheets and the general supervision of their publication was entrusted to W. H. Holmes"--From leaf [2], signed F. V. Hayden.
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Geologic Map of the United States / by the United States Geological Survey W. C. Mendenhall, Director Compiled by George W. Stose. Assisted by O. A. Lungstedt 1932
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Prime meridian: GM. Relief: no. Graphic Scale: Miles, kilometers. Projection: Polyconic. Printing Process: Lithography.
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