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2. Geologic history and hydrogeologic units of intermontane basins of the northern Rocky Mountains, Montana and Idaho
3. Geothermal map, upper part of madison group, Montana
4. Ground-water levels in intermontane basins of the northern Rocky Mountains, Montana and Idaho
5. Index map and bibliography of ground-water studies in Montana
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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