Columbia subject headings:
Frontier and pioneer life--West (U.S.)
Outlaws--West (U.S.)--History--19th century.
West (U.S.)--History.
Harvard subject headings:
Firearms--West (U.S.)--History--19th century.
Frontier and pioneer life--West (U.S.)
Outlaws--West (U.S.)--History--19th century.
West (U.S.)--History.
Princeton subject headings:
Frontier and pioneer life--West (U.S.)
Outlaws--West (U.S.)--History--19th century.
West (U.S.)--History.