Columbia subject headings:
Great Britain--History--Medieval period, 1066-1485.
Richard III, King of England, 1452-1485.
Warbeck, Perkin, 1474-1499.
Harvard subject headings:
Great Britain--History--Medieval period, 1066-1485.
Richard III, King of England, 1452-1485.
Warbeck, Perkin, 1474-1499.
Princeton subject headings:
Great Britain--History--Medieval period, 1066-1485.
Richard III, King of England, 1452-1485.
Warbeck, Perkin, 1474-1499.