1. The stratigraphical significance of the Protognathodus fauna from Stockum (Devonian/Carboniferous boundary, Rhenish Schiefergebirge);Alberti;Newsl. Stratigr.,1974
2. Observations fossil plants from the Devonian of eastern North America: IV. Plant remain from the Catskill delta deposits of northern Pennsylvania and southern New York;Arnold;Univ. Mich., Contrib. Mus. Paleontol.,1939
3. Subsurface Devonian section in southwestern Pennsylvania;Bayles;Am. Assoc. Pat. Geol., Bull.,1949
4. Mississippian Horton Group of Type Horton-Windsor District, Nova Scotia;Bell;Geol. Surv., Can. Mem.,1960
5. Description of the Ebensburg quadrangle;Butts;U.S. Geol. Surv. Geol. Atlas, Folio,1905