Columbia subject headings:
Inventions--History--Congresses.
Inventions--Philosophy--Congresses.
Science--History--Congresses.
Science--Philosophy--Congresses.
Harvard subject headings:
Discoveries in science--History--Congresses.
Inventions--History--Congresses.
Inventions--Philosophy--Congresses.
Science--History--Congresses
Science--Philosophy--Congresses
Princeton subject headings:
Inventions--History--Congresses.
Inventions--Philosophy--Congresses.
Science--History--Congresses.
Science--Philosophy--Congresses.