Oppenheimer, Dan. [Letter from Dan Oppenheimer to Harris Leon Kempner, March 10, 1955], letter, March 10, 1955; (https://texashistory.unt.edu/ark:/67531/metapth1472330/m1/1/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .