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I 19.76: 90-132 |
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I 19.76: 91-95 |
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[Reston, Va.] : U.S. Geological Survey, 1991.
I 19.76: 91-94 |
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Austin, Tex. : The Survey ; Denver CO : For sale by Books and Open-File Reports Section, 1993.
I 19.76: 93-75 |
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I 19.76: 93-62 |
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I 19.76: S.HRG. 105-588 |
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Austin, Tex. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : Books and Open-File Reports Section [distributor], 1991.
I 19.76: 90-594 |
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Austin, Tex. : U.S. Geological Survey ; Denver, Colo. : Books and Open-File Reports Section [distributor], 1991.
I 19.76: 90-598 |
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Austin, Tex. : The Survey ; Denver, Colo. : Books and Open-File Reports Section, distributor], 1992.
I 19.76: 92-160 |
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I 19.76: 96-650 |
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