Columbia subject headings:
Harvard subject headings:
Historic sites--Europe, Central--Congresses.
Industrial buildings--Europe, Central--History--Congresses.
Industries--Europe, Central--History--Congresses.
Industries--Technological innovations--Austria--Congresses.
Industries--Technological innovations--Germany--Congresses.
Regionalism--Europe, Central--Congresses.
Technology--Austria--History--Congresses.
Technology--Germany--History--Congresses.
Technology--Social aspects--Austria--Congresses.
Technology--Social aspects--Germany--Congresses.
Princeton subject headings:
Historic sites--Europe, Central--Congresses.
Industrial buildings--Europe, Central--History--Congresses.
Industries--Europe, Central--History--Congresses.
Regionalism--Europe, Central--Congresses.