1. Triangulation between the Hudson River and Cape Henry and Ohio River. June 30, 1885 Yale Public content 1885. 2013-10-16T20:03:56Z. 2018-12-18T19:59:56Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. cartographic image. Public. Middle Atlantic States.