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pg 200a: Geology of the Edwards Plateau and the Rio Grande Plain adjacent to Austin and San Antonio, Texas, with reference to the occurence of underground waters Publication 27281517

U. S. GEOLOGICAL SURVEY EIGHTEENTH ANNUAL REPORT PART II PL. XXI MAP SHOWING THE RELATIONS OF THE EDWARDS PLATEAU, THE BALCONES SCARP LINE, AND THE RIO GRANDE PLAIN. The hachured line is the Balcones escarpment; the Edwards Plateau is to the north of it, and the Rio Grande Plain is to the south.