1. Sketch showing tprogress of surveys on the Gulf Coast, Lake Pontchartrain, Mobile, and Pensacola Bays : with sub-sketch of Tortugas Harbor Yale Public content 1896. 2013-11-06T20:29:48Z. 2018-12-18T20:04:18Z. U.S. Coast and Geodetic Survey, issuing body. United States Coast and Geodetic Survey. English. cartographic image. Public. Alabama, Florida, Louisiana, and Mississippi.