(Last updated Aug. 17, 2010)
| Devonian-Mississippian Transition in Central Texas | P. E. Clouds, V. E. Barnes, W. H. Hass | Bureau of Economic Geology, Report of Investigations, No. 31, 1957 |
| Stratigraphic analysis of the Upper Devonian Woodford Formation, Permian Basin, West Texas and southeastern New Mexico | Comer, John B. | Austin, Tex. : Bureau of Economic Geology, University of
Texas at Austin, 1991. |
| Stratigraphy of the "Upper Silurian" and "Lower Devonian", Permian Basin, West Texas | Hoenig, Margaret Allen | M. S., The University of Texas at El Paso, 1976, 81 pages; AAT EP01192 |