Group of provost-guard at headquarters Army of Potomac, February, 1865, =L.=7251. Camp of Third Pennsylvania Cavalry at headquarters Army of Potomac, February, 1865, =L.=7298. Camp of Oneida Cavalry at headquarters Army of Potomac, February, 1865, =L.=7112. Camp of military telegraph operators at headquarters Army of Potomac, August, 1864, =S.=282. Group of officers at headquarters Army of Potomac, August, 1864, =L.=7135, =L.=7136. Capt. H. P. Clinton and clerks, at headquarters Army of Potomac, August, 1864, =L.=7529, =L.=7537. Military telegraph operators at headquarters Army of Potomac, August, 1864, =L.=7478, =S.=1023, =S.=1025, =S.=1030, =S.=1032, =S.=1033. Assistant engineers and draughtsmen at headquarters Army of Potomac, November, 1864, =L.=7106, =L.=7107, =L.=7116. Officers of First Massachusetts Cavalry at headquarters Army of Potomac, August, 1864, =L.=7390, =L.=7490. Officers and non-commissioned officers of First Massachusetts Cavalry at headquarters Army of Potomac, August, 1864 =L.=7354, =L.=7391. Company C, First Massachusetts Cavalry, at headquarters Army of Potomac, August, 1864, =L.=7295. Company D, First Massachusetts Cavalry, at headquarters Army of Potomac. August, 1864, =L.=7392, =L.=7476. Detachment of Third Indiana Cavalry at headquarters Army of Potomac, November, 1864, =L.=7023, =L.=7068. =One Hundred and Fourteenth Pennsylvania Infantry provost-guard at headquarters Army of Potomac, August, 1864:= --officers, =L.=7137, =L.=7138, =L.=7316, =L.=7602. --officers of Company--,=L.=7144, =L.=7145, =L.=7173. --Company F, =L.=7003, =L.=7038, =L.=7143, =L.=7175, =L.=7447. --Company G, =L.=7108, =L.=7348. --Company H, =L.=7077, =L.=7262, =L.=7263. =United States Engineer Battalion, August, 1864:= --Company A, =L.=7062, =L.=7384, =L.=7386. --Company C, =L.=7240, =L.=7568. --Company D, =L.=7054, =L.=7548. --Essayon's Dramatic Club, =L.=7336, =L.=7439. --Battalion headquarters, =L.=7065. =Camp of Fiftieth New York Engineers, November, 1864:= --colonel's quarters, Colonel Spaulding at the door, =L.=7059, =S.=1047. --headquarters, =L.=7167, =S.=1028, =S.=1048. --surgeon's quarters, =L.=7233. --officers' quarters and church, =L.=7210, =L.=7213, =S.=344, =S.=3338. --church, =L.=7151, =S.=345, =S.=3339, =S.=3340. --commissary department, =L.=7060. Officers of the Fiftieth Now York Engineers celebrating the 4th of July, 1864, =S.=790, =S.=791. Camp of Thirteenth New York Artillery, =S.=2495, =S.=2496. Sutler's tent, Second Division, Ninth Corps, =S.=2448. Winter headquarters of Sixth Army Corps, February, 1865, =L.=7545. Headquarters of General O. B. Willcox, August, 1864, =L.=7222. Winter quarters of photographers attached to United States Engineer Battalion, March, 1865, =L.=7347. Winter camp of Second Wisconsin Infantry, February, 1865, =L.=7543. Camp of chief ambulance officer of Ninth Corps, August, 1864, =L.=7538, =L.=7667, =S.=818.