1. Sketch showing extension of primary triangulation to Montreal : and resurveys of the coast east of Hudson River. June 30, 1897 Yale Public content 1897. 2013-11-08T18:14:46Z. 2013-11-21T21:36:39Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Northeastern States and Québec (Province).