Thompson, Jeff. E. Documents related to the case of The State of Texas vs. Lewis Campbell, principal, W. H. Campbell, and Robert Norton, securities, cause no. 708a, 1872, legal document, 1871/1872; (https://texashistory.unt.edu/ark:/67531/metapth104752/m1/1/: accessed May 26, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .