Columbia subject headings:
Birth control--Congresses.
Contraception--Congresses.
Contraceptive drugs--Congresses.
Contraceptives--Congresses.
Harvard subject headings:
Birth control--Congresses.
Contraception--Congresses
Contraceptive drugs--Congresses.
Contraceptives--Congresses.
Princeton subject headings:
Birth control--Congresses.
Contraception--Congresses.
Contraceptive drugs--Congresses.
Contraceptives--Congresses.