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 Name                           Last modified      Size  
 Parent Directory                                    -   
 report.pdf                     2019-11-25 11:26   20M  
 report-thumb.jpg               2019-11-25 11:26   11K

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U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/of/1951/0121/
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