Statistics for occurrence #1 of “Salem, Ma.” in entry salem-ma of Harper's Encyclopedia of United States History:

... Salem, Ma.
A city and the county seat of Essex county, Mass.; founded in 1626; incorporated as a city in 1836; noted for its historical...
Max. Freq. Min. Freq.
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† 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.