1. Triangulation between the St. Croix and Hudson Rivers : June 30, 1884 Yale Public content 1884. 2013-10-11T19:56:32Z. 2018-12-18T20:07:02Z. U.S. Coast and Geodetic Survey, issuing body. United States Coast and Geodetic Survey. English. cartographic image. Public. New England and Hudson River (N.Y. and N.J.).