Columbia subject headings:
Harvard subject headings:
Birth control--Cost effectiveness--Case studies--Congresses.
Birth control--Cost effectiveness--Congresses.
Birth control--Evaluation--Congresses.
Population policy--Cost effectiveness--Congresses.
Princeton subject headings:
Birth control--Cost effectiveness--Case studies--Congresses.
Birth control--Cost effectiveness--Congresses.
Birth control--Evaluation--Congresses.
Population policy--Cost effectiveness--Congresses.