Columbia subject headings:
Photography, Stereoscopic--Spain--Zaragoza--Exhibitions.
Zaragoza (Spain)--History--19th century--Pictorial works--Exhibitions.
Zaragoza (Spain)--History--20th century--Pictorial works--Exhibitions.
Harvard subject headings:
Photography, Stereoscopic--Exhibitions.
Zaragoza (Spain)--History--19th century--Pictorial works.
Zaragoza (Spain)--History--20th century--Pictorial works.
Princeton subject headings:
Photography, Stereoscopic--Spain--Zaragoza--Exhibitions.
Zaragoza (Spain)--History--19th century--Pictorial works--Exhibitions.
Zaragoza (Spain)--History--20th century--Pictorial works--Exhibitions.