The large letter "C" stamped on the base indicates that the cartridge was made by Creedmore Cartridge Company in Berberton, OH, from 1890 to 1892. Stamped on rim fire cartridges. Cartridge was found on Fort Leavenworth.
15th Field Artillery Brigade Headquarters Corps Artillery
This is a special staff committee report, containing an introduction to Corps artillery and its historical background, the artillery's increasing role in the global war, trained artillery commander's and staffs in the present Corps organization,...
"This 1942 manual is published for the information and guidance of personnel using the 20mm aircraft gun materiel M1 and M2 and contains technical information requried in the identification, use, and care of the materiel."