Statistics for occurrence #1 of “Mystic river” in chapter 1 of Medford Historical Society Papers, Volume 16.:

...sonage then was the home on High street, later the residence of the late John Ayres, now the site of the parish house of St. Joseph's Church. As the guest and family sat together looking out on the Mystic river below, or low lying Pasture Hill above, there must have been much pleasant conversation on subjects of common interest, for Miss Martineau's brother was a celebrated Unitarian divine. A relative ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Mystic River (Massachusetts, United States) 226 0 24 0 0 user votes
Mystic River (Connecticut, United States) 34 2 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.