Columbia subject headings:
Architecture, Medieval--Germany--North Sea Region.
Church architecture--Expertising--Germany--North Sea Region.
Harvard subject headings:
Architecture, Medieval--Germany--North Sea Region.
Church architecture--Germany--North Sea Region--Expertising.
Princeton subject headings:
Architecture, Medieval--Germany--Ostfriesland.
Church architecture--Germany--Ostfriesland.
Excavations (Archaeology)--Germany--Ostfriesland.
Ostfriesland (Germany)--Antiquities.