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by Wierl, J. A.
Published: U.S. Geological Survey ; Earth Science Information Center, Open-File Reports Section [distributor], 1996
Description: iv, 23 pages : illustrations ; 28 cm.
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by Wierl, J. A.
Published: [U.S. Dept. of the Interior, U.S. Geological Survey], 1998
Description: 1 folded sheet (4 pages) : color illustrations, color maps ; 28 cm.
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