Statistics for occurrence #1 of “Frederick, in Maryland” in chapter 2 of George H. Gordon, From Brook Farm to Cedar Mountain:

...West Roxbury, are taken from large sketches of house, camp, and field, made on the ground by a private soldier of the Regiment during our occupancy in the spring of 1861. The winter encampment near Frederick, in Maryland , in 1861-1862, is a reproduction of a sketch made by a German artist while we were in camp there. The reports of officers are taken, some from originals in my possession, some from Moore's Rebell...
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