Revised geologic map of the Fort Garland quadrangle, Costilla County, Colorado [cartographic material] / by Alan R. Wallace and Michael N. Machette ; U.S. Department of the Interior, U.S. Geological Survey.
- Relief shown by contours and spot heights. Includes location and index maps, text, lithologic column, 2 ancillary maps. Col. ill. on envelope.
- U.S. Geological Survey ;
- Held by
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