Beryl from Philadelphia County, Pennsylvania, USA
USA | |
| Mineralogy of Pennsylvania-1922 Samuel S. Gordon, pg. 234 |
| Samuel G. Gordon (1922) "Mineralogy of Pennsylvania" p. 225. |
Samuel G. Gordon (1922) "Mineralogy of Pennsylvania" p. 225. | |
Mineralogy of Pennsylvania, S. G. Gordon - 1922, p. 226. |
Philadelphia, Philadelphia County, Pennsylvania, USA