Goethite from
Canada | |
| Peatfield, Giles (n.d.) Personal communication. |
USA | |
| 01/May/2003, Peter Cristofono |
Mustoe, G.E., Vandenburg, D.G., Vandenburg, L.M. (1996) The minerals of Walker Valley, Skagit County, Washington. Washington Geology 24 (1), 22-29. |
Walker Valley, Skagit County, Washington, USA