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| Type | Company |
| Location | United States (North America) |
| Industry | Mining |
| Holdings | Newspaper clippings: 1971-2002 Annual reports: 1961-1966,1969-1982,1984,1985,1987-1989 |
| URI | https://pm20.zbw.eu/folder/co/064697 |
| ID | co/064697 |