Columbia subject headings:
Press--Philippines--History.
Publishers and publishing--Philippines--History.
Roces family.
Harvard subject headings:
Journalism--Philippines--History.
Newspaper publishing--Philippines--History--19th century.
Newspaper publishing--Philippines--History--20th century.
Philippine periodicals--History.
Press--Philippines--History.
Publishers and publishing--Philippines--Biography.
Roces family.
Princeton subject headings: