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USA | |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Wirth, K, W.S. Cordua, W. Keen, M Middleton & Z. Naiman (1998) The geology of the southeastern portion of the Mid-Continental Rift system, eastern Minnesota and western Wisconsin: 44th Institute on Lake Superior Geology part 2: 33-78. |
Utley Rhyolite Quarry, Utley, Green Lake County, Wisconsin, USA