[Letter from W. H. Louviere, to Directors of Imperial Sugar Company, November 16, 1956], letter, November 16, 1956; (https://texashistory.unt.edu/ark:/67531/metapth1182434/m1/1/: accessed June 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .