Columbia subject headings:
Ballistic missile defenses--Soviet Union.
Ballistic missile defenses--United States.
Ballistic missile defenses.
Harvard subject headings:
Ballistic missile defenses--Soviet Union.
Ballistic missile defenses--United States.
Ballistic missile defenses.
Princeton subject headings:
Ballistic missile defenses--Soviet Union.
Ballistic missile defenses--United States.
Ballistic missile defenses.