Columbia subject headings:
Harvard subject headings:
Composers--Germany--Congresses.
Environmentalists--Germany--Congresses.
Humboldt, Alexander von, 1769-1859--Congresses.
Learning and scholarship--Germany--Congresses.
Natural resources--Management--Congresses
Schilde, Klaus--Congresses.
Scientists--Germany--Congresses.
Technische Universität Bergakademie Freiberg--History--Congresses.
Princeton subject headings:
Composers--Germany--Congresses.
Environmentalists--Germany--Congresses.
Humboldt, Alexander von, 1769-1859--Congresses.
Learning and scholarship--Germany--Congresses.
Natural resources--Management--Congresses.
Schilde, Klaus--Congresses.
Scientists--Germany--Congresses.
Technische Universität Bergakademie Freiberg--History--Congresses.