Kempner, Isaac H. (Isaac Herbert), 1873-1967 & Leopold, N. E. [Letter from I. H. Kempner and N. E. Leopold to Black Hardware Co., January 7, 1949], letter, January 7, 1949; (https://texashistory.unt.edu/ark:/67531/metapth1503766/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .