Columbia subject headings:
Harvard subject headings:
Freiplatzaktion Z?rich--History.
Immigrants--Government policy--Switzerland--History--20th century.
Immigrants--Government policy--Switzerland--History--21st century.
Jewish refugees--Switzerland--History--20th century.
Jewish refugees--Switzerland--History--21st century.
Political refugees--Switzerland--History--20th century.
Political refugees--Switzerland--History--21st century.
Switzerland--Emigration and immigration--Government policy.
Princeton subject headings:
Freiplatzaktion Zürich (Organization)--History.
Immigrants--Government policy--Switzerland--History--20th century.
Immigrants--Government policy--Switzerland--History--21st century.
Jewish refugees--Switzerland--History--20th century.
Jewish refugees--Switzerland--History--21st century.
Political refugees--Switzerland--History--20th century.
Political refugees--Switzerland--History--21st century.
Switzerland--Emigration and immigration--Government policy.