1. Palynological considerations on the Westphalian and Stephanian: proposition for a parastratotype;Alpern,1969
2. The Mississippian and Pennsylvanian (Carboniferous) systems in the United States — West Virginia and Maryland;Arkle;U.S. Geol. Surv., Prof. Pap.,1979
3. Middle Pennsylvanian Series in the proposed Pennsylvanian System stratotype;Arndt,1979
4. Coal resources of the United States, January 1, 1974;Averitt;U.S. Geol. Surv., Bull.,1975
5. Proceedings of the First I.C. White Memorial Symposium, “The Age of the Dunkard”,1975