Columbia subject headings:
Picture frames and framing--Exhibitions.
Harvard subject headings:
Artists' materials--Europe--Exhibitions.
Picture frames and framing--Europe--History--19th century--Exhibitions.
Picture frames and framing--Europe--History--20th century--Exhibitions.
Picture frames and framing--Exhibitions.
Princeton subject headings:
Artists' materials--Europe--Exhibitions.
Picture frames and framing--Europe--History--19th century--Exhibitions.
Picture frames and framing--Europe--History--20th century--Exhibitions.