Columbia subject headings:
Ethnicity--Congresses.
Group identity--Congresses.
Humboldt, Alexander von, 1769-1859--Congresses.
Harvard subject headings:
Ethnicity--Congresses
Group identity--Congresses
Humboldt, Alexander von, 1769-1859--Congresses.
Princeton subject headings:
Humboldt, Alexander von, 1769-1859--Congresses.
Science--History--19th century--Congresses.
Scientific expeditions--History--19th century--Congresses.