Depths shown by gradient tints and soundings. Includes text, sailing directions. In upper margin: Harbor map no. Electrotype copy no. 1 by G. Mathiot U.S.C.S. In lower margin: Reduction for engraving by Chas. Mahon, draughtsman. Engraved by Sherman & Smith, N.Y. Title & sailing directions &c. by J. Knight U.S.C.S.