[Letter from Marceli and Andrezej Dobrzynski to H. Kempner, November 13, 1955], letter, November 13, 1955; (https://texashistory.unt.edu/ark:/67531/metapth1503133/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .