1. Triangulation between the Atlantic coast and West Virginia. June 30, 1893 Yale Public content 1893. 2013-10-30T19:12:27Z. 2013-11-21T21:39:32Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. East (U.S.) and Middle Atlantic States.