U. S. GEOLOGICAL SURVEY EIGHTEENTH ANNUAL REPORT PART II PL. LXIII
CHARACTERISTIC FOSSILS OF THE WEBBERVILLE BEDS. la, lb. Exogyra costata Say. 2, Gryphæa vesicularis Lamarck

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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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