Columbia subject headings:
Harvard subject headings:
Astronautics--Social aspects--Soviet Union--History--Congresses.
Astronautics--Soviet Union--History--Congresses.
Outer space--Exploration--Congresses.
Sputnik satellites--Social aspects--Soviet Union--History--Congresses.
Princeton subject headings:
Astronautics and civilization--Congresses.
Outer space--Exploration--Congresses.
Sputnik satellites--Congresses.