Columbia subject headings:
Abortion--Government policy--United States--Congresses.
Abortion--Law and legislation--United States--Congresses.
Abortion--Moral and ethical aspects--United States--Congresses.
Harvard subject headings:
Abortion--Government policy--United States--Congresses.
Abortion--Law and legislation--United States--Congresses.
Abortion--Moral and ethical aspects--United States--Congresses.
Princeton subject headings:
Abortion--Government policy--United States--Congresses.
Abortion--Law and legislation--United States--Congresses.
Abortion--United States--Moral and ethical aspects--Congresses.