Statistics for occurrence #1 of “Frederick, Md.” in chapter 64, page 218 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 1, Condensed history of regiments.:

...y of Baltimore to Harper's Ferry, and was engaged during the remainder of the year in guarding the upper Potomac; moving in the autumn to Hyattstown and Seneca Mills and making its winter quarters at Frederick, Md. In February, 1862, the regiment broke camp, and entering the Shenandoah Valley reconnoitered during the spring and early summer in the neighborhood of Winchester, Aldie, Front Royal and Manassas, bec...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Frederick, Md. (Maryland, United States) 1,147 3 249 3 0 user votes

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