1. Sturgis Formation (Upper Pennsylvanian) : a new map unit in the western Kentucky coal field Author/Creator: Kehn, Thomas M. Publication/Creation: Washington : U.S. Govt. Print. Off, 1973 Resource Type: Book Access & Availability: Loading
2. Sturgis Formation (Upper Pennsylvanian), a new map unit in the western Kentucky coal field Author/Creator: Kehn, Thomas M., author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1973 Resource Type: Book Access & Availability: Loading
3. The Supai Group -- subdivision and nomenclature Author/Creator: McKee, Edwin D. 1906-1984, (Edwin Dinwiddie), author Publication/Creation: [Reston, Va.] : United States Department of the Interior, Geological Survey, 1975 Resource Type: Book Access & Availability: Loading
4. The Supai Group--subdivision and nomenclature Author/Creator: McKee, Edwin D. 1906-1984. (Edwin Dinwiddie) Publication/Creation: Washington : U.S. Govt. Print. Off, 1975 Resource Type: Book Access & Availability: Loading