Kafka, Cornelia V. Yerkes. [Letter from Cornelia Yerkes to Fred Yerkes, May 5, 1943], letter, May 5, 1943; (https://texashistory.unt.edu/ark:/67531/metapth1296418/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .