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USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Kesling, R.V. (1978) Strata of the Middle Devonian Silica Formation. Field Excursions, University of Michigan: 1-33. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Bownocker, J.A., Stout, W. (1928) Mineral Industries of Ohio. Fourth Series Bulletin 33, Geological Survey of Ohio, Columbus, Ohio, 94 pages at p.79. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
Stoneco Auglaize Quarry, Junction, Paulding County, Ohio, USA