Columbia subject headings:
Belgium--Imprints.
Early printed books.
Printers' marks--Belgium.
Spanish imprints--Belgium.
Harvard subject headings:
Belgium--Imprints
Early printed books.
Printers' marks--Belgium.
Spanish imprints--Belgium
Princeton subject headings:
Belgium--Imprints.
Early printed books.
Printers' marks--Belgium.
Spanish imprints--Belgium.