1. Barton, D. C., 1928, The economic importance of salt domes: Texas Univ. Bull. 2801, p. 7-53. 

2. Udden, J. A.,  A neglected field in Stratigraphy, p. 55-66

3. Romer A. S., Vertebrate Faunal Horizons in the Texas Permo-Carboniferous Red Beds, p. 67-107.     

4. King, P. B. and King R. E., The Pennsylvanian and Permian Stratigraphy of the Glass Mountains, p. 109-145   

5. Lonsdale, J. T., and D. J. Crawford. 1928. “Pseudo-igneous Rock and Baked Shale from the Burning of Lignite, Freestone County, Texas.” p. 147–158. 

6. Sellards, E. H and Schoch E. P., Core Drill Tests for Potash in Midland County, Texas, p. 159-201