Columbia subject headings:
Harvard subject headings:
Immigrants--Germany--Schleswig-Holstein--History.
Schleswig-Holstein (Germany)--Emigration and immigration--Economic aspects--History.
Schleswig-Holstein (Germany)--History.
Princeton subject headings:
Human beings--Migrations--History.
Schleswig-Holstein (Germany)--Civilization.
Schleswig-Holstein (Germany)--Emigration and immigration--History.