Columbia subject headings:
Mason, Alden, 1919-2013--Exhibitions.
Harvard subject headings:
Mason, Alden, 1919---Exhibitions.
Painting, American--Exhibitions
Painting, Modern--20th century--United States--Exhibitions.
Princeton subject headings:
Mason, Alden, 1919-2013--Exhibitions.
Painting, American--20th century--Exhibitions.
Painting, American--Exhibitions.