United States Earthquakes, 1931, report, 1932; (https://digital.library.unt.edu/ark:/67531/metadc40324/m1/1/: accessed May 1, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
United States Earthquakes, 1931, report, 1932; (https://digital.library.unt.edu/ark:/67531/metadc40324/m1/1/: accessed May 1, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .