U.S GEOLOGICAL SURVEY EIGHTEENTH ANNUAL REPORT PART II PL. XXII
SULPHUR PEAK, UVALDE COUNTY, TEXAS; A BASALT NECK ON THE RIO GRANDE PLAIN.

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GEOLOGY OF THE EDWARDS PLATEAU AND RIO GRANDE PLAIN ADJACENT TO AUSTIN AND SAN ANTONIO, TEXAS, WITH REFERENCE TO THE OCCURRENCE OF UNDERGROUND WATERS.
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