Columbia subject headings:
America--Discovery and exploration--Spanish--Sources.
America--Early accounts to 1600.
Explorers--America--Correspondence.
Explorers--Spain--Correspondence.
Harvard subject headings:
America--Discovery and exploration--Spanish--Sources.
America--Early accounts to 1600.
Explorers--America--Correspondence.
Explorers--Spain--Correspondence.
Princeton subject headings:
America--Civilization.
America--Discovery and exploration.
Explorers--Portugal--Correspondence.
Explorers--Spain--Correspondence.