Chalcopyrite from selected localities.
USA | |
| USGS OFR 1966-87 |
| U.S. Geological Survey Professional Paper 223 |
U.S. Geological Survey Professional Paper 223 | |
| USGS Bulletin 1032-C (Drake,1957); U.S. Geological Survey Bulletin 1032-C |
| U.S. Geological Survey Professional Paper 371 |