United States. Bureau of Chemistry and Soils. and Texas Agricultural Experiment Station.. Soil map, Collin County, Texas, Map, 1935; digital image, (http://texashistory.unt.edu/ark:/67531/metapth19735/ : accessed June 19, 2013), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting UNT Libraries Government Documents Department, Denton, Texas.
Soil map, Collin County, Texas
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