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mods: Map showing altitude of the top of the Eagle Sandstone, Montana Geological Survey (U.S.) creator cartographer. Feltis, R. D. (Richard D.) 1930- author. cartographic map Maps. mtu 1982 monographic eng remote map 1 online resource (1 map). by R.D. Feltis. Relief shown by contours and spot heights. Includes bibliographical references, text, and location map. W1130000 W1040000 N0490000 N0450000 n-us-mt Scale 1:1,000,000 (W 113°--W 104°/N 49°--N 45°) Aquifers Montana Maps Geology, Stratigraphic Cretaceous Maps Aquifers Cretaceous Geologic Period Geology, Stratigraphic Montana From 65 to 140 million years ago fast I 19.42/4:82-4034 I 19.42/4:82-4034 Map showing altitude of the top of the Eagle Sandstone, Montana Feltis, R. D. (OCoLC)10685916 Water-resources investigations report ; 82-4034 https://purl.fdlp.gov/GPO/gpo135491 COP 161221 20211120104741.0 in00004167273 eng