41. Building a bomb-proof Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. 1861–1865] Institution: Boston Public Library
42. Building a pontoon bridge at Beaufort, S.C. Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: March 1862 Institution: Boston Public Library
43. Burial of the dead Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: December 15, 1862 Institution: Boston Public Library
44. Burnside Bridge, Antietam, Sept., 1862 Creator: Gardner, Alexander, 1821-1882 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: September 1862 Institution: Boston Public Library
45. Burnside Bridge, Antietam, September, 1862 Creator: Gardner, Alexander, 1821-1882 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: September 1862 Institution: Boston Public Library
46. Camp at headquarters Army of the Potomac Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. October 1863–March 1864] Institution: Boston Public Library
47. Camp in Monument Garden, Chattanooga Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. 1861–1865] Institution: Boston Public Library
48. Camp in the woods near Culpepper, Va., Nov., 1863 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: November 1863 Institution: Boston Public Library
49. Camp of 18th Penn. Cavalry Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: March 1864 Institution: Boston Public Library
50. Camp of 2d Wisconsin Infantry Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. May 1864–March 1865] Institution: Boston Public Library
51. Camp of 3d Penn. Cavalry, headquarters Army of the Potomac Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. May 1864–March 1865] Institution: Boston Public Library
52. Camp of 50th New York Engineers. Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. January 1864–May 1864] Institution: Boston Public Library
53. Camp of 6th New York Artillery Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: April 1864 Institution: Boston Public Library
54. Camp of military telegraph corps Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. October 1863–March 1864] Institution: Boston Public Library
55. Camp of the 114th Penn. Vols. Winter quarters Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. October 1863–March 1864] Institution: Boston Public Library
56. Camp of the "Oneida" cavalry, headquarters Army of the Potomac, March, 1865 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: March 1865 Institution: Boston Public Library
57. Camp of U.S. Engineer Battalion Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: [ca. October 1863–March 1864] Institution: Boston Public Library
58. Camp scene on the Pamunky River, 1862 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: 1862 Institution: Boston Public Library
59. A canvas pontoon bridge Creator: O'Sullivan, Timothy H., 1840-1882 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: May 24, 1864 Institution: Boston Public Library
60. Capt. Crawford, 114 Penn. Infantry, Aug. 1864 Format: Photographs Collection: American Civil War 20th Massachusetts Regiment (Collection of Distinction) Date: August 1864 Institution: Boston Public Library