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GQ0020D. Geologic map of the Threadgill Creek quadrangle, Gillespie and Mason Counties, Texas, by V. E. Barnes. Oversized color geologic map with text on the back, map scale 1:31,680, 1956. Downloadable PDF.
To purchase this map in paper format, please order GQ0020.
Keywords: maps, geologic maps, quadrangle maps, Threadgill Creek quadrangle, Gillespie County, Mason County, Texas