Columbia subject headings:
Germany--Emigration and immigration.
Immigrants--Germany--Social conditions.
Italians--Germany--Social conditions.
Italy--Emigration and immigration.
Social networks--Germany.
Harvard subject headings:
Germany--Emigration and immigration.
Immigrants--Germany--Social conditions
Italians--Germany--Social conditions.
Italy--Emigration and immigration.
Social networks--Germany.
Princeton subject headings:
Emigration and immigration.
Germany--Emigration and immigration.
Italians--Germany.