Columbia subject headings:
Avant-garde (Aesthetics)--Congresses.
Machinery--Aesthetic aspects--Congresses.
Machinery--History--Congresses.
Mechanical engineering--History--Congresses.
Technology--Social aspects--Congresses.
Harvard subject headings:
Avant-garde (Aesthetics)--Congresses.
Machinery--Aesthetic aspects--Congresses.
Machinery--History--Congresses.
Mechanical engineering--History--Congresses.
Technology--Social aspects--Congresses
Princeton subject headings:
Avant-garde (Aesthetics)--Congresses.
Machinery--Aesthetic aspects--Congresses.
Machinery--History--Congresses.
Mechanical engineering--History--Congresses.
Technology--Social aspects--Congresses.