Columbia subject headings:
Printers--Portugal.
Printing--Portugal--History.
Harvard subject headings:
Early printed books--Portugal--Bibliography.
Portugal--Imprints
Printers--Portugal.
Printing--Portugal--History--16th century.
Printing--Portugal--History--17th century.
Printing--Portugal--History.
Princeton subject headings:
Printers--Portugal.
Printing--Portugal--History.