This is an unusual 1896 map or nautical chart of Mobile Bay, Alabama by Curtis Lewis. Originally drawn in 1820, this example is a reissue printed in 1896 for William Trent Rossell’s congressional Report . This chart, which predates the work of the U.S. Coast Survey in this region, offers detailed sailing instructions, depth soundings, and other nautical data for all of Mobile Bay and parts of the Gulf of Mexico. Includes the City of Mobile as well as the town of Blakely.

http://www.geographicus.com/P/AntiqueMap/MobileBay-lewis-1880s