Statistics for occurrence #1 of “Mystic river” in chapter 1 of Medford Historical Society Papers, Volume 3.:

...vate parties, for the purpose of making a convenient way to the tide-mill; and by agreement with the owners of the land over which this way was laid the bridge was built of stone. The bridge over Mystic river , at Harvard avenue, was built in 1856; it is situated in the city of Medford and town of Arlington, and by a vote of the town of Medford in 1857 was named Usher's bridge. The bridge at Winthrop s...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Mystic River (Massachusetts, United States) 226 2 24 0 0 user votes
Mystic River (Connecticut, United States) 34 0 0 0 0 user votes
Mystic River (Massachusetts, United States) 18 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.