Statistics for occurrence #1 of “Essex Counties” in chapter 2, page 65 of William Schouler, A history of Massachusetts in the Civil War: Volume 1:

...rrative. The Third and Fourth Regiments were composed of companies belonging to towns in Norfolk, Plymouth, and Bristol Counties. The Sixth and Eighth were almost exclusively from Middlesex and Essex Counties . The field-officers of the Third were David W. Wardrop, of New Bedford, colonel; Charles Raymond, of Plymouth, lieutenant-colonel; John H. Jennings, of New Bedford, major; Austin S. Cushman, of New...
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