Columbia subject headings:
Abortion--Congresses.
Abortion--Moral and ethical aspects--Congresses.
Abortion--Religious aspects--Catholic Church--Congresses.
Abortion--United States--Congresses.
Harvard subject headings:
Abortion--Congresses
Abortion--Religious aspects--Catholic Church--Congresses.
Abortion--United States--Congresses.
Princeton subject headings:
Abortion--Congresses.
Abortion--Moral and ethical aspects--Congresses.
Abortion--Religious aspects--Catholic Church--Congresses.
Abortion--United States--Congresses.