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USA | |
| Dutton, C. E. (1972) Sampling of Copper-bearing Keweenawan Rocks of Northwestern Wisconsin: U.S. Geological Survey Open File Report 9.1267, 13p. Grant, U. S. (1901), Preliminary report on the copper-bearing rocks of Douglas County, Wisconsin, 2nd Ed.: Wisconsin Geological and Natural History Survey Bull. VI Economic Series #3, 83 p. |
| Cordua, W.S. (1991) Minerals of the Buckley Quarry, Douglas County, Wisconsin: Mineral News : 7(6): 2-3. |
| Dutton, C. E. (1972) Sampling of Copper-bearing Keweenawan Rocks of Northwestern Wisconsin: U.S. Geological Survey Open File Report 9.1267, 13p. Grant, U. S. (1901), Preliminary report on the copper-bearing rocks of Douglas County, Wisconsin, 2nd Ed.: Wisconsin Geological and Natural History Survey Bull. VI Economic Series #3, 83 p. |
| Dutton, C. E. (1972) Sampling of Copper-bearing Keweenawan Rocks of Northwestern Wisconsin: U.S. Geological Survey Open File Report 9.1267, 13p. Grant, U. S. (1901), Preliminary report on the copper-bearing rocks of Douglas County, Wisconsin, 2nd Ed.: Wisconsin Geological and Natural History Survey Bull. VI Economic Series #3, 83 p. |
| Grant, U. S. (1901), Preliminary report on the copper-bearing rocks of Douglas County, Wisconsin, 2nd Ed.: Wisconsin Geological and Natural History Survey Bull. VI Economic Series #3, 83 p. |
| Dutton, C. E. (1972) Sampling of Copper-bearing Keweenawan Rocks of Northwestern Wisconsin: U.S. Geological Survey Open File Report 9.1267, 13p. Grant, U. S. (1901), Preliminary report on the copper-bearing rocks of Douglas County, Wisconsin, 2nd Ed.: Wisconsin Geological and Natural History Survey Bull. VI Economic Series #3, 83 p. |
| Dutton, C. E. (1972) Sampling of Copper-bearing Keweenawan Rocks of Northwestern Wisconsin: U.S. Geological Survey Open File Report 9.1267, 13p. Grant, U. S. (1901), Preliminary report on the copper-bearing rocks of Douglas County, Wisconsin, 2nd Ed.: Wisconsin Geological and Natural History Survey Bull. VI Economic Series #3, 83 p. |
| Cordua, W.S., 1998, "Minerals of Wisconsin", Rocks and Minerals vol. 73 #6, p. 378 - 399. |