Goldberger, Erich. [Letter from Erich Goldberger to I. H. Kempner, June 7, 1940], letter, June 7, 1940; (https://texashistory.unt.edu/ark:/67531/metapth1452263/m1/1/: accessed July 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .