|
USA | |
|
| King & Foord, 1994. Mineralogy of Maine, Vol. 1, p.304 |
|
| King & Foord, 1994. Mineralogy of Maine, Vol. 1, p.304 |
|
| Ref.: Gordon, Samuel G. (1922), Mineralogy of Pennsylvania: 153. |
|
| Gordon: Mineralogy of Pennsylvania, 1922 p. 159 |
|
| Gordon: Mineralogy of Pennysylvania, 1922 p. 159 |
|
| Gordon\'s Mineralogy of Pennsylvania (1922) p. 191 |