Columbia subject headings:
Harvard subject headings:
America--Discovery and exploration--Spanish.
Philippines--Discovery and exploration--Spanish.
Scientific expeditions--Spain--History.
Princeton subject headings:
America--Discovery and exploration--Spanish--Congresses.
Philippines--Discovery and exploration--Spanish--Congresses.
Science--Spain--History--Congresses--Congresses.
Scientific expeditions--America--Congresses.
Scientific expeditions--Philippines--Congresses.
Spain--Exploring expeditions--Congresses.