Columbia subject headings:
Firearms--Law and legislation--United States.
Gun control--United States.
Public schools--Safety regulations--United States.
School violence--United States--Prevention.
Harvard subject headings:
Firearms--Law and legislation--United States
Public schools--Safety regulations--United States.
School violence--United States--Prevention
Princeton subject headings:
Firearms--Law and legislation--United States.
Public schools--Safety regulations--United States.
School violence--United States--Prevention.