Columbia subject headings:
Harvard subject headings:
America--Foreign relations--Europe.
America--Historical geography.
America--Historiography.
America--History.
Europe--Foreign relations--America.
Explorers--Germany--Travel--America.
Historians--Germany--Travel--America.
Humboldt, Alexander von, 1769-1859--Travel--America.
New Mexico--Historical geography.
New Mexico--Historiography.
New Mexico--Politics and government
New Spain--Maps.
Princeton subject headings:
America--History.
Geography--History.
South America--Geography--Sources.
South America--History--Sources.