Quartz from selected localities.
USA | |
| U.S. Geological Survey Professional Paper 319 |
USGS OFR 1966-87 | |
USGS OFR 1966-87; Emmons and Becker (1885) Statistics and Technology of the precious Metals. Census reports Tenth census. June 1, 1880, Volume 13 By United States. Census office. 10th census, 1880, United States. Census Office |