Columbia subject headings:
Germany--Relations--Greece--Congresses.
Greece--Relations--Germany--Congresses.
Philhellenism--Germany--Congresses.
Harvard subject headings:
Germany--Relations--Greece--Congresses.
Greece--Relations--Germany--Congresses.
Philhellenism--Germany--Congresses.
Princeton subject headings:
Germany--Relations--Greece--Congresses.
Greece--Relations--Germany--Congresses.