Bitumen from Cave-in-Rock Mining Sub-District, Hardin County, Illinois, USA
USA | |
| Mineralogical Record (1997) 28:3-49 |
Mineralogical Record (1997) 28:3-49 | |
Philip Bluemner photo | |
| Mineralogical Record (1997) 28:3-49 |
Russ Rizzo Collection via Jared Freiburg (Saga Minerals) | |
Mineralogical Record (1997) 28:3-49 | |
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Hastie's Quarry, Spar Mountain, Cave-In-Rock Mining Sub-District, Hardin County, Illinois, USA