Geologic map of the Denver 30ʹ x 60ʹ quadrangle, north-central Colorado [cartographic material] / by Karl S. Kellogg ... [et al.] ; U.S. Department of the Interior, U.S. Geological Survey.
Relief shown by contours and spot heights. Includes location map, 2 index maps, and lithologic columns.
- U.S. Geological Survey ;
- Held by
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