Columbia subject headings:
Portugal--Study and teaching--Canada--Bibliography.
Portugal--Study and teaching--United States--Bibliography.
Harvard subject headings:
Dissertations, Academic--Canada--Bibliography.
Dissertations, Academic--United States--Bibliography.
Portugal--Bibliography.
Portugal--Colonies--Bibliography.
Princeton subject headings:
Dissertations, Academic--Canada.
Dissertations, Academic--Portugal.
Dissertations, Academic--United States.
Portugal--Civilization--Bibliography.
Portugal--History--Bibliography.