Columbia subject headings:
Harvard subject headings:
Birth control--Europe--History--20th century--Congresses.
Europe--Population policy--History--20th century--Congresses.
Man-woman relationships--Europe--History--20th century--Congresses.
Oral contraceptives--Europe--History--20th century--Congresses.
Sex instruction--Europe--History--20th century--Congresses.
Sex role--Europe--History--20th century--Congresses.
Princeton subject headings:
Birth control--Europe--History--20th century--Congresses.
Europe--Population policy--History--20th century--Congresses.
Man-woman relationships--Europe--History--20th century--Congresses.
Oral contraceptives--Europe--History--20th century--Congresses.
Sex instruction--Europe--History--20th century--Congresses.
Sex role--Europe--History--20th century--Congresses.