Triangulation Map of Colorado T-Shirt
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Triangulation Map of Colorado. By Hayden, F.V. (188). Published by ''Washington: Department of The Interior. United States Geological and Geographical Surveys of the Territories".
Triangulation Map of Colorado. By Hayden, F.V. (188). Published by ''Washington: Department of The Interior. United States Geological and Geographical Surveys of the Territories".