Columbia subject headings:
Astronautics and state--Soviet Union.
Astronautics and state--United States.
Astronautics--Soviet Union.
Astronautics--United States.
Harvard subject headings:
Astronautics and state--Soviet Union.
Astronautics and state--United States.
Astronautics--Soviet Union
Astronautics--United States
Princeton subject headings:
Astronautics and state--Soviet Union.
Astronautics and state--United States.
Astronautics--Soviet Union.
Astronautics--United States.