Civil War Map #33 [Gettysburg Battlefield] : Plan of Chamberlain and Warren Avenues/ Gettysburg National Park Commission; Lt. Col. John P. Nicholson (chm.), Lt. Col. W. M. Robbins, Maj. C. A. Richardson, Lt. Col. E. B. Cope, engineer; M.W. Mattern, asst. eng.,, undated [not before 1895]

Civil War Map #33 [Gettysburg Battlefield] : Plan of Chamberlain and Warren Avenues/ Gettysburg National Park Commission; Lt. Col. John P. Nicholson (chm.), Lt. Col. W. M. Robbins, Maj. C. A. Richardson, Lt. Col. E. B. Cope, engineer; M.W. Mattern, asst. eng.,, undated [not before 1895], Box: Oversized Map Drawers C, Folder: (30.c). Roebling Family Collection, MC 654. New Brunswick Special Collections. https://archives.libraries.rutgers.edu/repositories/11/archival_objects/323727 Accessed November 19, 2024.