Robertson, Cora. [Letter from Cora Robertson to Linnet White, February 11, 1915], letter, February 11, 1915; (https://texashistory.unt.edu/ark:/67531/metapth204106/m1/1/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .