Hornblende Root Name Group from selected localities.
USA | |
| Mines of the Washington D.C Area |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |
USA | |
| Mines of the Washington D.C Area |
| Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p. |