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USA | |
| www.uwrf.edu (n.d.) http://www.uwrf.edu/~wc01/biotite.htm. |
| Hollister, V. & M. Cummings (1982) A summary of the Duval massive sulfide deposit, Marinette County, Wisconsin: Geoscience Wisconsin:6: 11-20 |
| Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078 |
| Olson, J. (1984) The Geology of the Lower Proterozoic Mc Caslin Formation, northeastern Wisconsin: Geoscience Wisconsin 9: 1-19. |
| Greenberg, J.K. (1983), Molybdenite in Wisconsin:occurrence and potential: Wisconsin Geological and Natural History Survey: Miscellaneous paper 83-2, 36 p. |
| Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078 |
| Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078 |