[Letter from Daniel W. Kempner to Vaughan's Seed Company, June 20,1949], letter, June 20, 1949; (https://texashistory.unt.edu/ark:/67531/metapth1340956/m1/2/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .