Indiana University proportional chambers, report, January 1, 1973; (https://digital.library.unt.edu/ark:/67531/metadc1033832/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
Indiana University proportional chambers, report, January 1, 1973; (https://digital.library.unt.edu/ark:/67531/metadc1033832/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .