Griffith, Glenn E.; Bryce, Sandra A.; Omernik, James M.; Comstock, Jeffrey A.; Rogers, Anne C.; Harrison, Bill et al. Ecoregions of Texas [Poster], poster, 2004; (https://texashistory.unt.edu/ark:/67531/metapth1662409/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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