This primary source comes from the Records of the War Department General and Special Staffs.
National Archives Identifier:
533310Full Citation: Pennsylvania, Gettysburg. A Harvest of Death; 7/1863; Records of the War Department General and Special Staffs, Record Group 165. [Online Version, https://www.docsteach.org/documents/document/pennsylvania-gettysburg-a-harvest-of-death, April 29, 2024]