Columbia subject headings:
Gettysburg Campaign, 1863.
United States--History--Civil War, 1861-1865--Hospitals.
Harvard subject headings:
Gettysburg, Battle of, Gettysburg, Pa., 1863
United States--History--Civil War, 1861-1865--Hospitals.
Princeton subject headings:
Gettysburg Campaign, 1863.
United States--History--Civil War, 1861-1865--Hospitals, charities, etc.