Columbia subject headings:
Filibusters--Nicaragua--Biography.
Filibusters--United States--Biography.
Nicaragua--History--Filibuster War, 1855-1860.
Walker, William, 1824-1860.
Harvard subject headings:
Filibusters--Nicaragua--Biography.
Nicaragua--History--Filibuster War, 1855-1860.
Walker, William, 1824-1860.
Princeton subject headings:
Walker, William, 1824-1860.