61. Company "H" 3d Mass. Artillery, Fort Lincoln Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: 1865 Institution: Boston Public Library
62. Detachment of 1st U.S. Cavalry Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. October 1863–March 1864] Institution: Boston Public Library
63. Detachment of 3d Indiana Cavalry; Army Headquarters Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. October 1863–November 1864] Institution: Boston Public Library
64. Dinner party at headquarters, Army of Potomac, April, 1864 Creator: O'Sullivan, Timothy H., 1840-1882 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: April 1864 Institution: Boston Public Library
65. Engineer Corps building a road Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. 1861–1865] Institution: Boston Public Library
66. Essayons Dramatic Club, U.S. Engineers Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. May 1864–March 1865] Institution: Boston Public Library
67. Federal outer life Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: December 16, 1864 Institution: Boston Public Library
68. Field hospital, 2d Division, 2d Corps Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. October 1863–March 1864] Institution: Boston Public Library
69. Field telegraph station Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: 1864 Institution: Boston Public Library
70. Filling their canteens Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: May 1864 Institution: Boston Public Library
71. General Grant's council of war Creator: O'Sullivan, Timothy H., 1840-1882 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: May 21, 1864 Institution: Boston Public Library
72. "Hard tack" Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. 1861–1865] Institution: Boston Public Library
73. "Hard tack" Acquia Creek, February, 1863 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: February 1863 Institution: Boston Public Library
74. "Hard tack and salt hoss," Cedar Level, Va., August, 1864 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: August 1864 Institution: Boston Public Library
75. Headquarters 10th Army Corps, Hatchies Run, Va. Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. 1861–1865] Institution: Boston Public Library
76. Headquarters 13th N.Y. Cavalry, Prospect Hill Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. 1861–1865] Institution: Boston Public Library
77. Headquarters 1st Brigade of Horse Artillery (popularly called "Flying Artillery") Creator: Gibson, James F., 1828- Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: February 1864 Institution: Boston Public Library
78. Headquarters of Gen. O.B. Wilcox, in front of Petersburg, August, 1864 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: August 1864 Institution: Boston Public Library
79. Independent Pennsylvania Battery "E" (Knapp's Battery) Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: September 1862 Institution: Boston Public Library
80. Interior of an Army hospital, 1864 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: 1864 Institution: Boston Public Library