by A.D. Bache, Superintendent U.S. Coast Survey from observations by Lieut. J.N. Maffitt of the hydrographic party under the command of Lieut. Chas. H. Davis U.S.N.
Relief shown by hachures.
"Scale of velocity in miles per hour."
At head of title: "A No.3."
Boston Public Library copy mounted on cloth with "Sketch of Boston Harbor and Bay" / U.S. Coast Survey, A.D. Bache. 1856.