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by Ahlfeld, David P.
Published: U.S. Dept. of the Interior, U.S. Geological Survey, 2009
Description: 1 online resource (vii, 65 pages) : illustrations.
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by Ahlfeld, David P.
Published: U.S. Dept. of the Interior, U.S. Geological Survey, 2011
Description: 1 online resource (vii, 45 pages) : illustrations.
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by Ahlfeld, David P.
Published: U.S. Dept. of the Interior, U.S. Geological Survey ; For sale by USGS Information Services, 2005
Description: vi, 124 pages : illustrations ; 28 cm.
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