Accompanied by text: Geologic framework and hydrostratigraphy of the Edwards and Trinity Aquifers within Hays County, Texas. vi, 20 pages ; 28 cm. "Prepared in cooperarion with the Edwards Aquifer Authority." Includes text, 2 location maps, table to explanation of hydrostratigraphic units, table, and color illustrations. Shipping list no.:2019-0018-S.
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