Columbia subject headings:
Harvard subject headings:
Earp, Wyatt, 1848-1929
Frontier and pioneer life--West (U.S.)
Law enforcement--West (U.S.)--History--19th century.
Masterson, Bat, 1853-1921
Peace officers--West (U.S.)--Biography
United States marshals--West (U.S.)--Biography.
West (U.S.)--History--1860-1890
Princeton subject headings:
Earp, Wyatt, 1848-1929.
Masterson, Bat, 1853-1921.
Peace officers--West (U.S.)--Biography.
West (U.S.)--History.