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Dear JR Phelps,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a file unit titled Regimental and Company Books of the 104th U.S. Colored Troops Infantry Regiment from a series titled Regimental and Company Books of Civil War Volunteer Union Organizations, 1861 - 1867 in the Records of the Adjutant General's Office, 1762-1917 (Record Group 94).
In addition, we located organization information by the National Park Services at https://www.nps.gov/civilwar/search-battle-units-detail.htm?battleUnitCode=UUS0104RI00C.
We hope this is helpful. Best of luck with your research!