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