Alpert, Arthur M. [Letter from Arthur M. Alpert to Edward Schreiber, February 9, 1966], letter, February 9, 1966; (https://texashistory.unt.edu/ark:/67531/metapth1300501/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .