Columbia subject headings:
Harvard subject headings:
Humboldt, Alexander von, 1769-1859.
Mexico--Description and travel.
Mexico--Economic conditions--1540-1810.
Mexico--History--Spanish colony, 1540-1810.
Mexico--Statistics.
Princeton subject headings:
Humboldt, Alexander von, 1769-1859.
Mexico--Description and travel.
Mexico--History--Spanish colony, 1540-1810.
Mexico--Statistics.
Statistics.