Title block to Offshore Soundings south of Cape Henlopen. Thesewere among the first offshore soundings to show the continental shelf break.
4/3/2019 11:53:05 AM
Date: 1847
Credit: NARA C&GS; Colllection
Location: Delaware, Offshore
Subject: Coast and Geodetic Survey
Subject: Archive Seafloor Mapping
Subject: Seafloor Mapping