Columbia subject headings:
Europe--Social conditions--20th century.
Social planning--Europe--History--20th century.
Social sciences--Europe--History--20th century.
Harvard subject headings:
Europe--Social conditions--20th century.
Europe--Social life and customs--20th century.
Social engineering--Europe--History--20th century.
Social planning--Europe--History--20th century.
Social sciences--Europe--History--20th century.
Social systems--Growth.
Sociology--Europe--History--20th century.
Princeton subject headings:
Europe--Social conditions--20th century.
Europe--Social life and customs--20th century.
Social engineering--Europe--History--20th century.
Social systems--Growth.
Sociology--Europe--History--20th century.