History of Antietam National Cemetery (page 11)
their inestimable services in this behalf, to which the merit of their work so justly entitles them. The signal services rendered by them were of such a character as to relieve this portion of the work of a great insurmountable burden under a different state of circumstances. The difficulties besetting them in the discovery of the names of the deceased were frequently solved by letters, receipts, diaries, memorandum books, photographs, or marks on the belts or cartridge boxes.