Statistics for occurrence #1 of “First Lieutenant B. F. Ryer” in chapter 22 of The Annals of the Civil War Written by Leading Participants North and South:

...f the Ninth United States Infantry, under Lieutenant Wood; Lieutenant Colonel Martin Burke, Third United States Artillery, commanding. Fort Schuyler, Twentieth and Twenty-eighth New York Batteries, First Lieutenant B. F. Ryer , Twentieth Battery, New York Volunteer Artillery, commanding. New York city, a volunteer guard at the Park barracks, designated the Invalid Corps. Beside the above-named commands, there was a ...
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