Phosphorite from Sevier County, Tennessee, USA
USA | |
| National Geochemical Database - Rocks - USGS Files # D152438 -D152447 and D154894 -D154895 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
USA | |
| National Geochemical Database - Rocks - USGS Files # D152438 -D152447 and D154894 -D154895 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |