Columbia subject headings:
Harvard subject headings:
Iron-works--Germany--Völklingen--Pictorial works.
Photography, Industrial--Germany--Völklingen.
Völklingen (Germany)--Buildings, structures, etc.--Pictorial works.
Völklinger Hütte.
Princeton subject headings:
Architecture, Industrial--Germany--Völklingen--Conservation and restoration.
Iron-works--Germany--Völklingen--Pictorial works.
Photography, Industrial--Germany--Völklingen.
Völklingen (Germany)--Buildings, structures, etc.--Pictorial works.
Völklinger Hütte.