Bell, Henry, III; Bush, Alfred Lerner & Turner, Robert L. Mineral Resources of the Paria-Hackberry Wilderness Study Area, Kane County, Utah, report, 1991; (https://digital.library.unt.edu/ark:/67531/metadc304356/m1/1/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .