Columbia subject headings:
Great Britain--History--Henry IV, 1399-1413.
Great Britain--History--Richard II, 1377-1399.
Henry IV, King of England, 1367-1413.
Richard II, King of England, 1367-1400.
Harvard subject headings:
Great Britain--History--Henry IV, 1399-1413.
Henry IV, King of England, 1367-1413
Princeton subject headings:
Great Britain--History--Henry IV, 1399-1413.
Great Britain--History--Richard II, 1377-1399.
Henry IV, King of England, 1367-1413.
Richard II, King of England, 1367-1400.