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I 19. 160 :
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Reston, VA : U.S. Dept. of the Interior, U.S. Geological Survey,
1999
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Reston, VA : U.S. Dept. of the Interior, U.S. Geological Survey
19--
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I 19.160: |
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Reston, VA : U.S. Dept. of the Interior, U.S. Geological Survey
19--
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I 19.160: |
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Reston, VA : U.S. Dept. of the Interior, U.S. Geological Survey
1992
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I 19.160: |
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Reston, VA : U.S. Dept. of the Interior, U.S. Geological Survey
19--
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
Rating:
Axe Federal Documents Online
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
Rating:
Axe Federal Documents Online
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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Axe Federal Documents Online
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines,
2002
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1980-
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines,
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines,
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines,
2002
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I 19.160: |
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Reston, VA : U.S. Dept. of the Interior, U.S. Geological Survey,
1999
Rating:
Axe Federal Documents Online
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1980-
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines,
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines,
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
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I 19.160: |
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Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
2002
Rating:
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I 19.160: |
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Washington, D.C. : Bureau of Mines
2002
Rating:
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