Niter from Piedmontia Domain, North America Plate
USA | |
| Plemons, Douglas (2006)The United States Saltpeter Cave Survey |
| Gale, Hoyt S. (1912) Nitrate Deposits : USGS Geological Bulletion 523 |
USA | |
| Plemons, Douglas (2006)The United States Saltpeter Cave Survey |
| Gale, Hoyt S. (1912) Nitrate Deposits : USGS Geological Bulletion 523 |