Anal Speculum., patent, March 25, 1890; (https://texashistory.unt.edu/ark:/67531/metapth172327/m1/2/: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Anal Speculum., patent, March 25, 1890; (https://texashistory.unt.edu/ark:/67531/metapth172327/m1/2/: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .