Mallory, Randy. Spirit of the Stone: Ancient rock art of the Pecos River region opens a window to the mysterious past., text, 2005-01~; (https://texashistory.unt.edu/ark:/67531/metadc1924266/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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