Native Ranges provided starting in Version 2

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Tilton, J. E. 1961. Ichthyological Survey of the Colorado River of Texas. Masters Thesis, University of Texas at Austin. http://dx.doi.org/10.26153/tsw/17774

Treviño-Robinson, D. 1959. The ichthyofauna of the Rio Grande, Texas and Mexico. Copeia 1959:253-256.

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