Columbia subject headings:
Harvard subject headings:
Fortification--Germany--Haselünne--History--Pictorial works.
Fortification--Germany--Haselünne--History.
Haselünne (Germany)--History--Pictorial works.
Haselünne (Germany)--History.
Princeton subject headings:
Cities and towns, Medieval--Germany--Lower Saxony.
Fortification--Germany--Haselünne--History.
Haselünne (Germany)--History.