Columbia subject headings:
Advertising--Circus--History--20th century.
Circus posters--History.
Circus posters--Russia (Federation)--History.
Circus--History--20th century--Pictorial works.
Commercial art--History--20th century.
Harvard subject headings:
Advertising--Circus--History--20th century.
Circus posters--History.
Circus posters--Russia (Federation)--History.
Circus--Pictorial works--History--20th century.
Commercial art--History--20th century
Princeton subject headings: