Columbia subject headings:
Harvard subject headings:
Firearms ownership--United States
Firearms--Law and legislation--United States
Gun control--United States
Gun control--United States--Public opinion.
Public opinion--United States
Violent crimes--United States
Princeton subject headings:
Firearms ownership--United States.
Firearms--Law and legislation--United States.
Gun control--United States--Public opinion.
Gun control--United States.
Public opinion--United States.
Violent crimes--United States.