Columbia subject headings:
Harvard subject headings:
Biology--Research--Germany--History--Congresses.
Biology--Research--Russia--History--Congresses.
Biology--Research--Soviet Union--History--Congresses.
Germany--Relations--Russia--Congresses.
Germany--Relations--Soviet Union--Congresses.
Russia--Relations--Germany--Congresses.
Soviet Union--Relations--Germany--Congresses.
Princeton subject headings:
Biology--Research--Germany--History--Congresses.
Biology--Research--Russia (Federation)--History--Congresses.
Germany--Relations--Russia--Congresses.
Germany--Relations--Soviet Union--Congresses.
Russia--Relations--Germany--Congresses.
Soviet Union--Relations--Germany--Congresses.