Maxey, George F. Geology as a Georegional Influence on Quercus Fagaceae Distribution in Denton and Coke Counties of Central and North Central Texas and Choctaw County of Southeastern Oklahoma, Using GIS as an Analytical Tool.. Denton, Texas. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc5144/. Accessed July 4, 2015.
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