Kafka, Cornelia V. Yerkes. [Letter from Cornelia Yerkes, September 20, 1943], letter, September 20, 1943; (https://texashistory.unt.edu/ark:/67531/metapth1296269/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .