[1912 Dalton Adding, Listing and Calculating machine], physical object, 1912; (https://texashistory.unt.edu/ark:/67531/metapth969/m1/1/: accessed May 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[1912 Dalton Adding, Listing and Calculating machine], physical object, 1912; (https://texashistory.unt.edu/ark:/67531/metapth969/m1/1/: accessed May 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .