1. The configuration of the Pennsylvanian and Dunkard (Permian) strata in West Virginia; a challenge to classical concepts;Arkle,1969
2. The geology of the Pittsburgh coal;Cross;W.Va. Geol. Econ. Surv., R.I.,1952
3. Pennsylvanian sedimentation of the central Appalachians;Donaldson,1974
4. The Mississippian and Pennsylvanian (Carboniferous) Systems in the United States — Pennsylvania and New York;Edmunds;U.S. Geol. Surv. Prof. Pap.,1979