Columbia subject headings:
Harvard subject headings:
Pornography--Government policy--United States--Congresses.
Pornography--Psychological aspects--Congresses.
Pornography--Social aspects--United States--Congresses.
Princeton subject headings:
Pornography--Government policy--United States--Congresses.
Pornography--Psychological aspects--Congresses.
Pornography--Social aspects--United States--Congresses.