Copper from Siskiyou County, California, USA
USA | |
| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 159. |
| (1911) A Manual of the Copper Industry of the World. The Copper Handbook Vol. 10. Horace J. Stevens |