Williston, C. Lincoln. [Letter from Dr. May Owen to Mr. C. Lincoln Williston, December 2, 1968], letter, December 2, 1968; (https://texashistory.unt.edu/ark:/67531/metapth830161/m1/1/: accessed April 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .