Thorogummite from selected localities.
USA | |
| Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania |
| Rocks & Min.: 11:90.; Arthur Montgomery (1957) Three occurrences of high-thorian uraninite near Easton, Pennsylvania. Am. Min. 42: 804-820; Rocks & Min.: 17:344.; Am.Min.: 45: 39-52 |
Sherrer Quarry, C.K. Williams Quarry complex, Chestnut Hill, Easton, Northampton County, Pennsylvania, USA