Alpert, Arthur M.; Thompson, Edward Randall, Jr. & Kempner, Harris Leon, Jr. [Letter from Arthur M. Alpert, Edward R. Thompson, Jr. and Harris L. Kempner, Jr. to I. H. Kempner, Robert L. Kempner, and Harris L. Kempner, March 10, 1964], letter, March 10, 1964; (https://texashistory.unt.edu/ark:/67531/metapth1197781/m1/1/: accessed July 1, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .