Figure 1. Surface-water basins, ecoregions, and major aquifers of the South-Central Texas study unit, Texas.
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U.S. Department of the Interior, U.S. Geological Survey Persistent URL: http://pubsdata.usgs.gov/pubs/of/1999/ofr99243/figure1.htm Page Contact Information: USGS Publishing Network Last modified: Wednesday, December 07 2016, 04:56:58 PM