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USA | |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp. |
| R. Kelley Laughlin |
| Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp. |
| www.marquette.org/Travel/rockhounding.htm |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp. |
| Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp. |
| Econ Geology (1993)88:104-122 |
| Beste, Bob (2005) Location Guide for Rockhounds in the United States (3rd ed.) |
| Rocks & Min.: 18:302-303 |
Mary Ellen pit, St. Louis County, Minnesota, USA