- Murphys Mining District (Esmeralda Mining District; Sperry Mining District)
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Clark, William B., Lydon, Philip A. (1963) Mines and Mineral Resources of Calaveras County, California. County Report 2. California Division of Mines and Geology Heyl, George Richard (1948a) Foothill copper belt of the Sierra Nevada: California Division Mines Bulletin 144: 11-29 Van Nostrand Reinholt Press: 82. |