Columbia subject headings:
Harvard subject headings:
Industrial archaeology--Germany--Swabian Alps--Congresses.
Iron industry and trade--Germany--Swabian Alps--History--Congresses.
Swabian Alps (Germany)--Antiquities--Congresses.
Princeton subject headings:
Excavations (Archaeology)--Germany--Swabian Alps--Congresses.
Iron industry and trade--Germany--Swabian Alps--History--Congresses.
Swabian Alps (Germany)--Antiquities--Congresses.