Vaughan's Seed Company. [Letter from Vaughan's Seed Company, June 27, 1952], letter, June 27, 1952; (https://texashistory.unt.edu/ark:/67531/metapth1325837/m1/1/: accessed July 10, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .