Columbia subject headings:
Baler (Philippines)--Siege, 1898.
Philippines--History--Revolution, 1896-1898.
Harvard subject headings:
Baler (Philippines)--History--Siege, 1898-1899.
Philippines--History--Revolution, 1896-1898.
Princeton subject headings:
Baler (Philippines)--Siege, 1898.
Philippines--History--Revolution, 1896-1898.