Columbia subject headings:
Danube River Region--Emigration and immigration.
Emigration and immigration--Health aspects.
Social integration--Danube River Region.
Harvard subject headings:
Danube River Region--Emigration and immigration--Health aspects.
Danube River Region--Emigration and immigration.
Europe--Emigration and immigration.
Social integration--Danube River Region.
Princeton subject headings:
Danube River Region--Emigration and immigration.
Emigration and immigration--Health aspects.
Social integration--Danube River region.