Preliminary chart of the northwestern part of the Gulf of Mexico. Unfinished proof.

Scale 1:600,000.
LC Civil War Maps (2nd ed.), 17.8
At head of title: U.S. Coast Survey, A. D. Bache, Supdt.
Chart of the Gulf coast from Pensacola Bay to the Rio Grande (Rio Bravo del Norte) showing soundings and bottom contours at 6, 12, and 18 feet.
"Note: In portions of this chart where no soundings have yet been made by the Coast Survey, they have been taken from the Admiralty chart of Gauld's survey made in 1764 to 1771, which agree well with the Coast Survey soundings in positions covered by both."
Description derived from published bibliography.
Available also through the Library of Congress web site as raster image.