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    Charter Oak Mine : exploring Montana's mining history on the Helena National Forest by United States. Forest Service, Helena National Forest (Mont.)

    Published: U.S. Dept. of Agriculture, Forest Service, Helena Forest Foundation, 2004
    Description: 1 sheet : illustrations ; 22 x 28 cm, folded to 22 x 10 cm.
    Government Document Book
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    Charter Oak Mine : exploring Montana's mining history on the Helena National Forest

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