1. Generalized bedrock geologic map of the Helena area, west-central Montana Author/Creator: Reynolds, Mitchell W. Publication/Creation: [Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey, 2002 Resource Type: Map Edition: Version 1.0, last modified 07-Aug-2002. Access & Availability: Loading
2. Geologic and structure map of the north half of the Powder River Basin, southeastern Montana and northeastern Wyoming Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, Va. : U.S. Geological Survey, 1992 Resource Type: Map Access & Availability: Loading
3. Geologic and structure map of the south half of the Powder River Basin and adjacent areas, northeastern Wyoming Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
4. Geologic and structure map, with contours on top of the Pierre Shale, for the north half of the Powder River Basin, southeastern Montana and northeastern Wyoming Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
5. Geologic and structure map, with contours on top of the Pierre Shale, for the south half of the Powder River Basin, northeastern Wyoming Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
6. Geologic and structure maps of the Kalispell 1° x 2° quadrangle, Montana, and Alberta and British Columbia Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
7. Geologic and structure maps of the Salt Lake City 1° x 2° quadrangle, Utah and Wyoming Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, VA : The Survey ; Denver, CO : For sale by Map Distribution, 1992 Resource Type: Map Access & Availability: Loading
8. Geologic cross section C-C' through the Appalachian basin from Erie County, north-central Ohio, to the Valley and Ridge Province, Bedford County, south-central Pennsylvania Author/Creator: Ryder, Robert T. Publication/Creation: [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2012 Resource Type: Map Access & Availability: Loading
9. Geologic cross section C-C' through the Appalachian basin from Erie County, north-central Ohio, to the Valley and Ridge Province, Bedford County, south-central Pennsylvania Author/Creator: Ryder, Robert T. Publication/Creation: Denver, Colo. : For sale by U.S. Geological Survey, Information Services Resource Type: Map Access & Availability: Loading
10. Geologic cross section D-D' through the Appalachian Basin from the Findlay Arch, Sandusky County, Ohio, to the Valley and Ridge Province, Hardy County, West Virginia Publication/Creation: Reston, Va. : U.S. Geological Survey ; Denver, CO : Information Services [distributor], 2009 Resource Type: Map Access & Availability: Loading