Statistics for occurrence #1 of “Baltimore, Md.” in chapter 5 of Historic leaves, volume 1, April, 1902 - January, 1903:

...rnor Washburn of Maine as second lieutenant, Tenth Maine Volunteers, was dated September 23, 1861, and as first lieutenant, June, 1862. This regiment went about November 5, 1861, to Patterson Park, Baltimore, Md. , and remained there some months. It was classed in the Middle Department, Major-General John E. Wool, U. S. A., commanding, and was soon ordered to Relay House, nine miles out on the Baltimore &...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Baltimore, Md. (Maryland, United States) 9,542 12 714 4 0 user votes

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