Columbia subject headings:
Art, Modern--19th century--Exhibitions.
Art, Modern--20th century--Exhibitions.
Art--Private collections--Washington (D.C.)--Exhibitions.
Ring, Gustave--Art collections--Exhibitions.
Ring, Marion--Art collections--Exhibitions.
Harvard subject headings:
Art, Modern--19th century--Exhibitions
Art, Modern--20th century--Exhibitions
Art--Private collections--Washington (D.C.)--Exhibitions.
Ring, Gustave--Art collections--Exhibitions.
Ring, Marion--Art collections--Exhibitions.
Princeton subject headings:
Art, Modern--19th century--Exhibitions.
Art, Modern--20th century--Exhibitions.
Art--Private collections--Washington (D.C.)--Exhibitions.
Ring, Gustave--Art collections--Exhibitions.
Ring, Marion--Art collections--Exhibitions.