Supplement to the Annual Reports, Alphabetical Index of Maine Volunteers (1867), p. 1207: York Joseph M, 30th Infantry, Co. B. York Joseph M, private, B, 30, Infantry.
Image · dated 1867 · source: Internet Archive (public-domain scan or U.S. government publication); supplementtoannu00main.

How it is shown: Complete page as scanned; no crop, no retouch.
Keep in mind: A printed official report, not the original muster roll or return.