Columbia subject headings:
Harvard subject headings:
Blind--Education--Portugal.
Blind--Portugal--Social conditions.
Braille, Louis, 1809-1852--Anniversaries, etc.
Braille--Portugal--History--Exhibitions.
Princeton subject headings:
Biblioteca Nacional (Portugal)--Exhibitions.
Blind teachers--France--Biography.
Blind--Biography.
Blind--Portugal--Exhibitions.
Blind--Printing and writing systems--Exhibitions.
Blind--Services for--Portugal--History--Exhibitions.
Braille, Louis, 1809-1852--Exhibitions.