Statistics for occurrence #1 of “Merrimac river” in chapter 4 of Medford Historical Society Papers, Volume 3.:

... The territory about Mistick river was the favorite dwelling-place of the Pawtucket tribe of Indians, whose hunting-grounds extended as far east as Piscataqua, and as far north as Concord, on the Merrimac river . The nearest, and in fact the principal, land route between Salem and the other settlements on the eastern coast of New England, and Charlestown, Boston, and the other settlements on the south sh...
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