Antique “Tidal Currents of Nantucket Shoals” Naval Nautical Chart Map, 19th Century, “U.S. Coast Survey A.D. Bache Supdt. By C.A. Schott Computing Division C.S. From observations by: C.H. Davis C.H. Mc. Blair & H.S. Stellwagen, Lieuts. U.S.N. Assistants, 1854”.

8.5 in. x 11 in. Overall 14.75 in. x 16 in.