Columbia subject headings:
Harvard subject headings:
Portrait photography--History--19th century--Exhibitions.
Portrait photography--Political aspects--Exhibitions.
Portrait photography--Social aspects--Exhibitions.
Princeton subject headings:
Carte de visite photographs--Exhibitions.
Celebrities--Portraits--History--19th century--Exhibitions.
Photography--History--19th century--Exhibitions.
Photography--Scientific applications--History--19th century--Exhibitions.
Portrait photography--History--19th century--Exhibitions.
Portraits.