Columbia subject headings:
Harvard subject headings:
Crosses--Austria.
Crosses--Germany.
Ironwork--Austria.
Ironwork--Germany.
Wrought-iron--Austria.
Wrought-iron--Germany.
Princeton subject headings:
Crosses--Austria.
Crosses--Germany.
Ironwork--Austria.
Ironwork--Germany.
Wrought-iron--Austria.
Wrought-iron--Germany.