Columbia subject headings:
Electric lighting--Social aspects--Congresses.
Inventions--Social aspects--Congresses.
Science--Social aspects--Congresses.
Technology--Social aspects--Congresses.
Harvard subject headings:
Discoveries in science--History--Congresses.
Electric lighting--Social aspects--Congresses.
Inventions--Social aspects--Congresses.
Science--Social aspects--Congresses
Technology--Social aspects--Congresses
Princeton subject headings:
Electric lighting--Social aspects--Congresses.
Inventions--Social aspects--Congresses.
Science--Social aspects--Congresses.
Technology--Social aspects--Congresses.