Columbia subject headings:
Harvard subject headings:
Germany--History--Saxon House, 919-1024
Poland--History--Piast period, 960-1386
Princeton subject headings:
Germany--History--To 1517.
Germany--Kings and rulers--Housing--History--To 1500.
Poland--History--To 1572.
Poland--Kings and rulers--Housing--History--To 1500.
Sacred space--Germany--History--To 1500.
Sacred space--Poland--History--To 1500.