Columbia subject headings:
Harvard subject headings:
Humboldt, Alexander von, 1769-1859--Diaries.
Humboldt, Alexander von, 1769-1859--Travel--Mexico.
Mexico--Description and travel.
Princeton subject headings:
Diaries.
Humboldt, Alexander von, 1769-1859--Diaries.
Mexico City (Mexico)--Description and travel.
Scientists--Germany--Diaries.
Veracruz-Llave (Mexico : State)--Description and travel.