1. Progress of the triangulation between Eastern Missouri and Western Kansas : along or near the 39th parallel. June 30, 1893 Yale Public content 1893. 2013-10-30T18:49:38Z. 2013-11-21T21:26:37Z. U.S. Coast and Geodetic Survey, issuing body. U.S. Coast and Geodetic Survey. English. Public. Middle West.