Columbia subject headings:
Mexico--Commerce--Philippines--History.
Mexico--Relations--Philippines--History.
Philippines--Commerce--Mexico--History.
Philippines--History.
Philippines--Relations--Mexico--History.
Harvard subject headings:
Galleons--Spain--History--Congresses.
Merchant marine--Spain--History--Congresses.
Mexico--Commerce--Philippines--History--Congresses.
Mexico--Relations--Philippines--Congresses.
Philippines--Commerce--Mexico--History--Congresses.
Philippines--Relations--Mexico--Congresses.
Princeton subject headings:
Galleons--Spain--History--Congresses.
Merchant marine--Spain--History--Congresses.
Mexico--Commerce--Philippines--History--Congresses.
Mexico--Relations--Philippines--Congresses.
Philippines--Commerce--Mexico--History--Congresses.
Philippines--Relations--Mexico--Congresses.