Geib, W. J. (Warren Jacob); Watson, E. B. (Ebenezer Bliss); Rice, Thomas D. (Thomas Donnelly) & Lounsbury, Clarence. Soil Survey of Camp County, Texas, book, June 17, 1910; (https://texashistory.unt.edu/ark:/67531/metapth19805/m1/5/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .