William M. Gregg, d. 1881. American Civil War 1861-1865.

Photograph shows William M. Gregg of 23rd New York Infantry Regiment and 179th New York Infantry Regiment seated in tent.
This record contains unverified, old data from caption card.
Original negative in National Archives Record Group 111: Records of the Office of the Chief Signal Officer, 1860-1985, Series: Mathew Brady Photographs of Civil War-Era Personalities and Scenes, 1921-1940, Item: Maj. William M. Gregg, 23rd N.Y. Volunteers.
No. B1015.
Civil War Collection (Library of Congress).
Civil War Photograph Collection (Library of Congress).