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USA | |
| Bornhorst T.J. Barron R. J. (2013) Geologic Overview of the Keweenaw Peninsula, Michigan, Institute on Lake Superior Geology. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Wolff R. G., Huber N. K., (1973 The Copper Harbor Conglomerate (Middle Keweenawan) on Isle Royale, Michigan and its Regional Implications, USGS Paper 754-B |
| Elmore, R. Douglas, (1983), Precambrian non-marine stromatolites in alluvial fan deposits, Copper Harbor Conglomerate, upper Michigan, Department of Geological Sciences, University of Michigan, |
| Wolff R. G., Huber N. K., (1973 The Copper Harbor Conglomerate (Middle Keweenawan) on Isle Royale, Michigan and its Regional Implications, USGS Paper 754-B |
| Elmore R, D. (1983) Precambrian non-marine stromatolites in alluvial fan deposits, Copper Harbor Conglomerate, upper Michigan, Department of Geological Sciences, University of Michigan. |
| (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. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
Calumet & Hecla 1937 Exploration Shaft, Schoolcraft Township, Houghton County, Michigan, USA