Scofields' Quality Printers, Inc. [Acknowledgment of receipt of briefs by John J. Herrera - 1969-03-27], letter, March 27, 1969; (https://texashistory.unt.edu/ark:/67531/metapth249733/m1/1/: accessed May 23, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .