Columbia subject headings:
Germany--Relations--Russia.
Russia--Relations--Germany.
Harvard subject headings:
Germans--Russia--Biography--Congresses.
Germans--Russia--History--Congresses.
Germany--Relations--Russia--Congresses.
Russia--Relations--Germany--Congresses.
Princeton subject headings:
Germans--Russia--Biography--Congresses.
Germans--Russia--History--Congresses.
Germany--Relations--Russia--Congresses.
Russia--Relations--Germany--Congresses.