Columbia subject headings:
Harvard subject headings:
Engineering--Congresses--Indexes--Periodicals.
Science--Congresses--Indexes--Periodicals.
Technology--Congresses--Indexes--Periodicals.
Princeton subject headings:
Engineering--Congresses--Indexes--Periodicals.
Science--Congresses--Indexes--Periodicals.
Technology--Congresses--Indexes--Periodicals.