Columbia subject headings:
Harvard subject headings:
Age and employment--Germany--Congresses.
Demographic transition--Germany--Congresses.
Germany--Population--Congresses.
Older people--Employment--Germany--Congresses.
Princeton subject headings:
Age and employment--Germany--Congresses.
Demographic transition--Germany--Congresses.
Germany--Population--Congresses.
Older people--Employment--Germany--Congresses.