Amphibole Supergroup from selected localities.
USA | |
| Pardee, J.T., Park, C.F. (1948) Professional Paper Vol. 213, Gold deposits of the southern Piedmont. US Geological Survey; 130. doi:10.3133/pp213 |
| Hopkins, 0. B., (1914), A report on the asbestos, talc, and soapstone deposits of Georgia: Georgia Geological Survey Bulletin 29, 172-173. |