[Hansen standing by chalk board], photograph, November 13, 1906; (https://digital.library.unt.edu/ark:/67531/metadc1166350/m1/1/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
[Hansen standing by chalk board], photograph, November 13, 1906; (https://digital.library.unt.edu/ark:/67531/metadc1166350/m1/1/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .