File 25878 is a 51.2MB PowerPoint Uploaded:
Feb8 11 Last Modified: 2011-02-08 13:57:20 http://d32ogoqmya1dw8.cloudfront.net/files/NAGTWorkshops/geophysics/seismic11/workspace/walds_powerpoint_presentation.v3.ppt
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Provenance U.S. Geological Survey (U.S. Government) so freely available & not copyrighted. Simply acknowledge with "Courtesy David Wald, USGS".
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