Columbia subject headings:
Harvard subject headings:
Social security--Switzerland--Zurich (Canton)--History--20th century.
Social security--Switzerland--Zurich--History--20th century.
Working class--Switzerland--Zurich (Canton)--History--20th century.
Working class--Switzerland--Zurich--History--20th century.
World War, 1914-1918--Switzerland--Zurich (Canton)
World War, 1914-1918--Switzerland--Zurich.
Zurich (Switzerland : Canton)--History--20th century.
Zurich (Switzerland)--History--20th century.
Princeton subject headings:
Social security--Switzerland--Zurich (Canton)--History--20th century.
Social security--Switzerland--Zurich--History--20th century.
Working class--Switzerland--Zurich (Canton)--History--20th century.
Working class--Switzerland--Zurich--History--20th century.
World War, 1914-1918--Switzerland--Zurich (Canton).
World War, 1914-1918--Switzerland--Zurich.
Zurich (Switzerland : Canton)--History--20th century.
Zurich (Switzerland)--History--20th century.