{"value"=>"<p>Diagrams are graphic charts (bar graphs) summarizing sickness and mortality for three distinct groups: British Armies, United States Armies, and Army of the Potomac, covering the periods 1793 -1859 for British Armies, 1840-1862 for United States Armies, and 1861-1863 for the Army of the Potomac. Diagrams present data on annual rates of sickness per 1000 soldiers and annual death rates per 1000 soldiers (which are classified as deaths by wounds, by sickness, and by all causes). Rates of sickness and casualty are examined through one or more variables including season of the year, state in which recruited, geographic location, and whether in active or inactive service. Diagrams also compare rates of sickness and mortality in commissioned officers and enlisted men, or volunteers and regulars. Most documents in this group were originally rolled together and labeled “Diagrams of sickness and mortality.\"</p>"}