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Kocher, A. E. (Arthur E.) and United States. Bureau of Soils.. Reconnoissance soil survey of south-central Texas, Book, June 12, 1915; digital images, (http://texashistory.unt.edu/ark:/67531/metapth19754 : accessed November 22, 2009), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting University of North Texas Libraries, Denton, Texas.