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United States. Bureau of Mines. Branch of Data Collection and Coordination.
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Washington, DC : U.S. Dept. of the Interior, U.S. Bureau of Mines,
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, DC : U.S. Dept. of the Interior, Bureau of Mines, 1989-
1989-
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines,
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1980-
1980-
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
Evaluation:
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