Columbia subject headings:
Demarcation line of Alexander VI.
Missions--Philippines.
Philippines--Discovery and exploration.
Philippines--History--1521-1812--Sources.
Harvard subject headings:
Demarcation line of Alexander VI.
Missions--Philippines
Philippines--Discovery and exploration.
Philippines--History--Sources.
Princeton subject headings:
Demarcation line of Alexander VI.
Missions--Philippines.
Philippines--Discovery and exploration.
Philippines--History--1521-1812--Sources.