| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 131, 164. (1908, September) The Copper Resources of California. Bulletin 50. California State Mining Bureau […(abstract): Geol. Zentralbl., Band 11: 350 (1908)]: 398 Reid, John A. (1907b), The ore deposits in Copperopolis, Calaveras County, California: Economic Geology: 2: 380-417 Whitney, J.D. (1865), Geological survey of California, Geology, 1, Report of progress and synopsis of the field work from 1860 to 1864 […(abstract): American Journal of Science, 2nd. series: 41: 124, 231-246, 351-368]: 255 |
Copperopolis, Foothill Copper Belt, Calaveras County, California, USA