Columbia subject headings:
Harvard subject headings:
Emigration and immigration.
Immigrants--Germany--Prussia--History.
Prussia (Germany)
Prussia (Germany)--Emigration and immigration--Government policy.
Prussia (Germany)--Emigration and immigration--History.
Prussia (Germany)--Ethnic relations.
Princeton subject headings:
Immigrants--Germany--Prussia--History--Congresses.
Prussia (Germany)--Emigration and immigration--Congresses.
Prussia (Germany)--Ethnic relations--Congresses.
Social integration--Germany--Prussia--History--Congresses.