Feld, M. M. [Letter from A. Stanley Dreyfus to M. M. Feld, March 1, 1958], letter, March 1, 1958; (https://texashistory.unt.edu/ark:/67531/metapth1514347/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .