Kempner, Isaac H. (Isaac Herbert), 1873-1967. [Letter from I. H. to Cecile Kempner, April/May, 1947], letter, 1947; (https://texashistory.unt.edu/ark:/67531/metapth977358/m1/1/: accessed May 25, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .