| Online link | https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2003-001/johnston94.shp.faq.html |
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| Description | The sediment data presented in this data layer were from an ecological study sited near the Portsmouth Naval Shipyard, Kittery, Maine. The analog data were originally converted into digital form for inclusion in a Gulf of Maine Contaminated Sediments Database. |
| Originators | (); (); (); (); (); (); (); (); and () |