1. Triangulation between the Atlantic coast and West Virginia. June 30, 1894 Yale Public content 1894. 2013-10-31T18:18:28Z. 2013-11-21T21:39:45Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. East (U.S.) and Middle Atlantic States.