Statistics for occurrence #1 of “Boston harbor” in article 3 of The Daily Dispatch: August 21, 1863., [Electronic resource]:

...road iron, and skillful men accompanying them. Brig. Gen. Gonverneur K. Warren, Chief of Engineers in the Army of the Potomac, has been made a Major General. Mrs. Lincoln took a ride down Boston harbor in a revenue cutter on the 15th inst. Sixty National Banks have been established in the United States since June 20th. Gold was quoted in New York on the 17th at 124a123¼.
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Boston Harbor (Massachusetts, United States) 627 2 1 0 0 user votes
Boston Harbor (New Hampshire, United States) 0 0 0 0 0 user votes
Boston Harbor (Washington, United States) 0 0 0 0 0 user votes
Boston Harbor (Washington, United States) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.