Columbia subject headings:
Harvard subject headings:
America--Discovery and exploration--Congresses.
Explorers--America--Congresses.
Explorers--Spain--Congresses.
Indians--Ethnic identity--Congresses.
Indians--First contact with Europeans--Congresses.
Princeton subject headings:
America--Discovery and exploration--Congresses.
Explorers--America--Congresses.
Explorers--Spain--Congresses.
Indians--Ethnic identity--Congresses.
Indians--First contact with Europeans--Congresses.