Tourmaline from Brooks Range, North America
USA | |
| (2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey |
(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey | |
| (2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey |
| (2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey |