21. 12" BC M1917 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: February 1918 Institution: National Archives at Boston
22. 12" B.L.R. model 1900 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 1913 Institution: National Archives at Boston
23. 12" B.L.R. model 1900, detail of carriage Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 1913 Institution: National Archives at Boston
24. 12 inch B.L. rifle, M. 1898 Mii mounted on barbette carriage, M. 1892 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 1913 Institution: National Archives at Boston
25. 12 inch B.L. rifle, M. 1900 mounted on D.C.L.F. M. 1901 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 1913 Institution: National Archives at Boston
26. 12 inch B.L. rifle, M. 1900 mounted on D.C.L.F. M. 1901 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 1913 Institution: National Archives at Boston
27. 12" Mortar M1896 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: May 4, 1916 Institution: National Archives at Boston
28. 12" Mortar M1896 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: May 4, 1916 Institution: National Archives at Boston
29. 12" Motor mounted on 36" gauge trucks Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: May 17, 1921 Institution: National Archives at Boston
30. 12" Shot truck Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 17, 1913 Institution: National Archives at Boston
31. 120 M/M A.A gun Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1949–1950] Institution: National Archives at Boston
32. 14" BC cradle pattern Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: October 1919 Institution: National Archives at Boston
33. 14" DC M1907 MI Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 6, 1914 Institution: National Archives at Boston
34. 14" DC M1907 MI Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 6, 1914 Institution: National Archives at Boston
35. 14" Rifle M1907 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1908–1926] Institution: National Archives at Boston
36. 14" RR carriage M/E Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: 1918 Institution: National Archives at Boston
37. 14" RR carriage M/E Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: 1918 Institution: National Archives at Boston
38. 14" RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: September 12, 1922 Institution: National Archives at Boston
39. 14" RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: September 12, 1922 Institution: National Archives at Boston
40. 14" RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: June 8, 1922 Institution: National Archives at Boston