Columbia subject headings:
Radicalism--Europe.
Regional planning--Europe.
Social classes--Europe.
Working class--Europe.
Harvard subject headings:
Labor and laboring classes--Europe.
Radicalism--Europe.
Regional planning--Europe.
Social classes--Europe
Working class--Economic aspects--Europe.
Working class--Europe.
Princeton subject headings:
Labor--Europe.
Radicalism--Europe.
Regional planning--Europe.
Social classes--Europe.