Columbia subject headings:
Harvard subject headings:
Castles--Germany--Sankt Goar Region--History.
Fortification--Germany--Saint Goar Region--History.
Rheinfels Site (Germany)
Saint Goar Region (Germany)--History, Military.
Princeton subject headings:
Castles--Germany--Hesse--History.
Hesse (Germany)--History--1247-1567.
Rheinfels (Germany : Castle)--History.