A Chart Exhibiting the Normal Course & Velocity of the Tidal Current at Ebb in Boston Harbor
Description:
"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." At head of title: "A No.3."