Chamber of Commerce of the United States of America. [Letter from the Chamber of Commerce of the United States of America, December 24, 1963], letter, December 24, 1963; (https://texashistory.unt.edu/ark:/67531/metapth1509124/m1/1/: accessed July 10, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .