Columbia subject headings:
Abortion--Canada.
Abortion--United States--Public opinion.
Abortion--United States.
Abortion.
Public opinion--United States.
Harvard subject headings:
Abortion--Canada.
Abortion--United States
Abortion--United States--Public opinion
Abortion.
Public opinion--United States
Princeton subject headings:
Abortion--Canada.
Abortion--United States--Public opinion.
Abortion--United States.
Abortion.
Public opinion--United States.