Columbia subject headings:
Civil defense--United States.
Nuclear bomb shelters.
Shielding (Radiation)
Harvard subject headings:
Civil defense--United States
Fallout shelters.
Gamma rays.
Nuclear warfare.
Radioactive fallout.
Shielding (Radiation)
Princeton subject headings:
Civil defense--United States.
Fallout shelters.
Gamma rays.
Nuclear warfare.
Radioactive fallout.
Shielding (Radiation)