Geology of Central Texas
- Hydrogeologic atlas of the Hill Country Trinity Aquifer, Blanco, Hays and Travis Counties, central Texas
- Guidebook to the Geology of Travis County
- Walking the Forty Acres : Building Stones -- Precambrian to Pleistocene
- Geologic Maps of Central Texas: scanned 1:24 to 1:250k raster maps that are georeferenced for GIS and also available as Google Earth files.
- USGS Map Viewer--find geologic maps of all types and scales.