Geology of the Simcoe Mountains volcanic area, Washington [cartographic material] / by Richard A. Sheppard.
Relief shown by contours and spot heights. Includes summary, index map and 2 geologic cross sections. "Geology mapped 1958-59." "Base from Army Map Service topographic quadrangles, Yakima and The Dalles, 1:250,000."
- Washington Dept. of Conservation, Division of Mines and Geology
- Held by
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