Crockett, Bob H. [Letter from Bob H. Crockett to Robert P. Crockett, April 10 1878], letter, April 10, 1878; (https://texashistory.unt.edu/ark:/67531/metapth39010/m1/1/: accessed May 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .