Areal Geology: Texas Llano Quadrangle
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Areal Geology: Texas Llano Quadrangle, map, May 1911; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc11814/: accessed December 10, 2023), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .