Columbia subject headings:
Harvard subject headings:
Cartography
Humboldt, Alexander von, 1769-1859
Natural history
Naturalists--Germany--Biography.
Physical geography
Scientists--Germany--Biography
Princeton subject headings:
Cartography.
Humboldt, Alexander von, 1769-1859.
Map drawing.
Natural history.
Naturalists--Germany--Biography.
Physical geography.
Scientists--Germany--Biography.