1. Revised correlation chart of coal beds, coal zones, and key stratigraphic units in the Pennsylvanian rocks of eastern Kentucky Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
2. Revision of the type Mankomen Formation (Pennsylvanian and Permian), Eagle Creek area, Eastern Alaska Range, Alaska Author/Creator: Richter, Donald H. Publication/Creation: Washington : U.S. Govt. Print. Off, 1975 Resource Type: Book Access & Availability: Loading
3. Revision of the type Mankomen Formation (Pennsylvanian and Permian), Eagle Creek area, eastern Alaska Range, Alaska Author/Creator: Richter, Donald H., author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1975 Resource Type: Book Access & Availability: Loading