General Geological Map of Colorado.

General Geological Map of Colorado. Department of the Interior, U.S. Geological and Geographical Survey of the Territories, F.V. Hayden, U.S. Geologist in Charge. Surveyed in 1873, '74, '75 & '76. Sheet IV.

Hayden, F.V.

1881

1881

Department of The Interior. United States Geological and Geographical Surveys of the Territories.

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