Graphite from
USA | |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Van Nostrand Reinholt Press: 59. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
USA | |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Van Nostrand Reinholt Press: 59. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |