Bulletin of the United States Geological Survey No. 90 Page: 4
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Powell, J. W.; Clarke, F. W. & Schneider, E. A. Bulletin of the United States Geological Survey No. 90, report, 1892; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1115044/m1/4/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.