Columbia subject headings:
Harvard subject headings:
Emigration and immigration law--Germany--History.
Foreign workers--Germany--History.
Germany--Emigration and immigration
Labor demand--Germany--History.
Skilled labor--Germany--History.
Princeton subject headings:
Emigration and immigration law--Germany--History.
Foreign workers--Germany--History.
Germany--Emigration and immigration.
Labor demand--Germany--History.
Skilled labor--Germany--History.