Columbia subject headings:
Art, American--20th century--Exhibitions.
Art, American--Exhibitions.
Thoreau, Henry David, 1817-1862--Exhibitions.
Thoreau, Henry David, 1817-1862--Influence--Exhibitions.
Harvard subject headings:
Art, American--Exhibitions
Art, Modern--19th century--United States--Exhibitions.
Art, Modern--20th century--United States--Exhibitions.
Nature (Aesthetics)--Exhibitions
Thoreau, Henry David, 1817-1862--Exhibitions.
Thoreau, Henry David, 1817-1862--Influence--Exhibitions.
Princeton subject headings: