Columbia subject headings:
Harvard subject headings:
Humboldt, Alexander von, 1769-1859.
Latin America--Discovery and exploration.
Natural history--Latin America--History--19th century.
Phytogeography--Latin America--History--19th century.
Princeton subject headings:
Humboldt, Alexander von, 1769-1859.
Latin America--Discovery and exploration.
Natural history--Latin America--History--19th century.
Phytogeography--Latin America--History--19th century.