1. Progress of the transcontinental triangulation and reconnaissance : eastward from the Pacific Coast. June 30, 1886 Yale Public content 1886. 2013-10-18T16:11:23Z. 2018-12-10T20:33:58Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. cartographic image. Public. Southwest, New.