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2. Map showing outcrops of pre-quaternary ash-flow tuffs and volcaniclastic rocks, basin and range province, Northern California
3. Map showing outcrops of pre-quaternary basaltic rocks, basin and range province, Oregon
4. Map showing outcrops of pre-Quaternary ash-flow tuffs and volcaniclastic rocks, basin and range province, Arizona
5. Map showing outcrops of pre-quaternary basaltic rocks, basin and range province, Arizona
6. Map showing altitude of the top of the "Dakota Sandstone," Montana
7. Map showing altitude of the top of the Eagle Sandstone, Montana
8. Map showing altitude of the top of the Fox Hills-Lower Hell Creek aquifer, Montana
9. Map showing altitude of the top of the Judith River Formation, Montana
10. Map showing altitude of the top of the Lakota Formation and equivalent rocks, Montana
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