1. The Mississippian and Pennsylvanian (Carboniferous) systems in the United States Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1979 Resource Type: Book Access & Availability: Loading
2. The Mississippian and Pennsylvanian (Carboniferous) systems in the United States Publication/Creation: Washington : U.S. Govt. Print. Off, 1979 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 1110 A-DD. Access & Availability: Loading