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OFM0018. Geologic Map of the Helotes Quadrangle, Texas, by E. W. Collins. Oversize geologic map on color topographic base, scale 1:24,000, with explanatory text, 1995. To purchase this map as a downloadable PDF, please order OFM0018D.
Keywords: maps, geologic maps, Helotes area, Texas
Citation
Collins, E. W., 1995, Geologic Map of the Helotes Quadrangle, Texas: The University of Texas at Austin, Bureau of Economic Geology Open-File Map No. 18, map scale 1:24,000.
