Surficial geologic map of the Alton quadrangle / Richard Goldsmith.
- Relief shown by contours and spot heights. "Revised digital map published 2006." "Open-file map published 1995." "Geology mapped 1994." Base from U.S. Geological Survey,1995 map. Includes quadrangle location map and index chart to adjoining quadrangles and authors.
- Held by
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