Geologic Map of Llano & Burnet Quadrangles Highlighting Mines & Prospects_1910
Geologic Map (1:750,000) by A.C. Spencer, Sidney Paige, W.S. Bayley and Fred H. Kay
Highlighting quarries, mines and prospects in the early 1900's.
Reference: Paige, Sidney, Mineral Resources of the Llano-Burnet Region, with an account of the PreCambrian Geology, 1911, USGS Bulletin 450, 103 p.