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Geologic map of the Hilltop Quadrangle, Gillespie, Llano, and Mason Counties, Texas
Geology of the Hilltop Quadrangle, Gillespie, Llano, and Mason Counties, Texas
Hilltop Quadrangle, Gillespie, Llano, and Mason Counties, Texas
Title from text on map: Geology of the Hilltop Quadrangle, Gillespie, Llano, and Mason Counties, Texas.
Title from envelope: Hilltop Quadrangle, Gillespie, Llano, and Mason Counties, Texas.
Geologic quadrangle map (University of Texas at Austin. Bureau of Economic Geology) ; no. 2