Columbia subject headings:
Intercontinental ballistic missiles--History.
MX (Weapons system)--History.
United States. Air Force--Weapons systems--History.
Harvard subject headings:
Intercontinental ballistic missiles--History.
MX (Weapons system)--History.
United States. Air Force--Weapons systems--History.
Princeton subject headings:
Intercontinental ballistic missiles--History.
MX (Weapons system)--History.
United States. Air Force--Weapons systems--History.