Marzola, John A. [Envelope from John A. Marzola to John J. Herrera - 1961-10-31], letter, Date Unknown; (https://texashistory.unt.edu/ark:/67531/metapth250640/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .