1. Altitude, depth, and thickness of the Galena-Platteville bedrock unit in the subcrop area of Illinois and Wisconsin Author/Creator: Brown, Timothy A., author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2000 Format: Map Access & Availability: Loading
2. Map showing altitude of the top of the Swift Formation, Montana Author/Creator: Feltis, R. D. 1930- (Richard D.), author Publication/Creation: Denver, Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey Format: Map Access & Availability: Loading
3. Map showing cumulative thickness of sandstone in the Swift Formation, Montana Author/Creator: Feltis, R. D. 1930- (Richard D.), author Publication/Creation: Denver, Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey Format: Map Access & Availability: Loading
4. Map showing total thickness of the Swift Formation, Montana Author/Creator: Feltis, R. D. 1930- (Richard D.), author Publication/Creation: Denver, Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey Format: Map Access & Availability: Loading