Columbia subject headings:
Perugia (Italy)--History--19th century--Pictorial works.
Perugia (Italy)--History--20th century--Pictorial works.
Photography--Italy--Perugia--History--19th century.
Photography--Italy--Perugia--History--20th century.
Harvard subject headings:
Perugia (Italy)--History--19th century--Pictorial works.
Perugia (Italy)--History--20th century--Pictorial works.
Photography--Italy--Perugia--History--19th century.
Photography--Italy--Perugia--History--20th century.
Princeton subject headings:
Perugia (Italy)--History--19th century--Pictorial works.
Perugia (Italy)--History--20th century--Pictorial works.
Photography--Italy--Perugia--History--19th century.
Photography--Italy--Perugia--History--20th century.