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 Name                           Last modified      Size  
 Parent Directory                                    -   
 report.pdf                     2018-01-23 17:45   53M  
 report-thumb.jpg               2018-01-23 17:14   26K

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U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/of/1981/0381/
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