Columbia subject headings:
Harvard subject headings:
Terrorism--Europe--History--19th century.
Terrorism--Russia--History--19th century.
Terrorism--United States--History--19th century.
United States--History--Civil War, 1861-1865
Princeton subject headings:
Terrorism--Europe--History--19th century.
Terrorism--Russia--History--19th century.
United States--History--Civil War, 1861-1865.