Columbia subject headings:
Cities and towns--Germany.
Emigration and immigration--Economic aspects.
Germany--Emigration and immigration--Economic aspects.
Urban economics.
Urbanization--Germany.
Harvard subject headings:
Germany--Emigration and immigration--Economic aspects--History.
Germany--Emigration and immigration--Government policy--History.
Germany--Emigration and immigration--History.
Rural-urban migration--Germany--History.
Urbanization--Germany--History.
Princeton subject headings: