1. Diagram B showing changes in the bottom of New York Harbor in the vicinity of Midlle Ground Shoal : from a comparison of surveys made in 1855 and 1872 Yale Public content 1873. 2013-08-22T17:15:33Z. 2013-09-04T19:50:04Z. United States Coast Survey, issuing body. U.S. Coast Survey. English. cartographic image. Public. New York Harbor (N.Y. and N.J.).