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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1983

Government Document Journal

2

Government Document Journal

3

Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1995

Government Document Journal

4

Government Document Journal

5

Government Document Journal

6

Government Document Journal

7

Government Document Journal

8

Government Document Journal

9

Washington, DC : U.S. Dept. of the Interior, Bureau of Mines, 1989

Government Document Journal

10

Government Document Journal

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