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 Name                           Last modified      Size  
 Parent Directory                                    -   
 report-thumb.jpg               2011-09-06 14:08  7.5K  
 report.pdf                     2011-09-02 15:26   23M

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U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/of/1981/0423/
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