Columbia subject headings:
Harvard subject headings:
Industries--Social aspects--Switzerland--Zurich (Canton)--History.
Labor--Switzerland--Zurich (Canton)--History.
Zurich (Switzerland : Canton)--History.
Princeton subject headings:
Industries--Social aspects--Switzerland--Zurich (Canton)--History.
Labor--Switzerland--Zurich (Canton)--History.
Zurich (Switzerland : Canton)--History.