1. Progress of the triangulation between the Rocky Mountains and western Nevada : along or near the 39th parallel. June 30, 1890 Yale Public content 1890. 2013-10-25T15:00:05Z. 2013-11-21T21:29:41Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Nevada, Utah, and Wyoming.