|
USA | |
| Heyl, A. & Pearre, N (1965) Copper, zinc, lead, iron cobalt and barite deposits of the Piedmont Upland in Maryland: Maryland Geological Survey: Bulletin 28, 72 p. |
| Heyl, A. & Pearre, N (1965) Copper, zinc, lead, iron cobalt and barite deposits of the Piedmont Upland in Maryland: Maryland Geological Survey: Bulletin 28: 55-56. |
| Dana 7:I:264. |
| Heyl, A. and Pearre, N. (1965) |
| Econ Geol (1989) 84:663-675 Rocks & Min.:26:111,121. |
| Stuart Herring |
| J. Wingard, personal observation 5/1/04 |
| Econ Geol (1989) 84:663-675 |
| Dana 6:1071. |
| Dana 6: 1071 Rocks & Min.: 11:27, 121. |
| Stuart Herring |
| Maryland Geological Survey, Vol. IX: 317. |
Beasman prospect, Eldersburg, Carroll County, Maryland, USA