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1881. 2013-09-19T21:15:09Z. 2018-12-10T20:21:43Z. U.S. Coast and Geodetic Survey, issuing body. United States Coast and Geodetic Survey. English. cartographic image. Public. South Atlantic States and Middle Atlantic States.
3. Primary triangulation between the Maryland and Georgia base-lines (Northern part) : June 30, 1881
1881. 2013-09-27T18:24:10Z. 2018-12-10T20:21:30Z. U.S. Coast and Geodetic Survey, issuing body. United States Coast and Geodetic Survey. English. cartographic image. Public. South Atlantic States and Middle Atlantic States.
1881. 2013-09-19T19:25:23Z. 2018-12-13T14:38:03Z. U.S. Coast and Geodetic Survey, issuing body. United States Coast and Geodetic Survey. English. cartographic image. Public. Middle Atlantic States.
1881. 2013-09-27T17:02:37Z. 2018-12-13T14:37:54Z. U.S. Coast and Geodetic Survey, issuing body. United States Coast and Geodetic Survey. English. cartographic image. Public. Middle Atlantic States.