Survey of Matinicus Island Harbor, and Belfast Bay and Harbor, Maine; and Ipswich Bay and Harbor, Massachusetts. Letter from the Chief Clerk of the War Department, transmitting, in compliance with the act of March 3, 1875, copies of the reports of Lieutenant Colonel Thom, Corps of Engineers, of surveys of Matinicus Island Harbor, and Belfast Bay and Harbor, Maine, and Ipswich Bay and Harbor, Massachusetts.