[Letter from Bill Nelson to "friend", undated], letter, [1977..1982]; (https://texashistory.unt.edu/ark:/67531/metadc1787989/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
[Letter from Bill Nelson to "friend", undated], letter, [1977..1982]; (https://texashistory.unt.edu/ark:/67531/metadc1787989/m1/2/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .