| Online link | https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2000-352/seamarc_meta.faq.html |
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| Description | This ArcView GIS layer is a 25 m version of the completed SeaMARC 1A sidescan sonar mosaic. |
| Originators | Twichell, David C.; Paskevich, Valerie F.; Twichell, David C.; and Schwab, William C. |