Coffey, George Nelson and United States. Bureau of Soils.. Reconnoissance soil survey of South Texas, Book, June 16, 1910; digital images, (http://texashistory.unt.edu/ark:/67531/metapth19753/ : accessed May 21, 2013), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting UNT Libraries Government Documents Department, Denton, Texas.
Reconnoissance soil survey of South Texas
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