Columbia subject headings:
Canada--In art--Exhibitions.
Canada--Pictorial works--Exhibitions.
Landscape painting, American--19th century--Exhibitions.
Landscape painting, American--20th century--Exhibitions.
Landscape painting, Canadian--19th century--Exhibitions.
Landscape painting, Canadian--20th century--Exhibitions.
Photography--Canada--History--19th century--Exhibitions.
Photography--Canada--History--20th century--Exhibitions.
Photography--United States--History--19th century--Exhibitions.
Photography--United States--History--20th century--Exhibitions.
United States--In art--Exhibitions.
United States--Pictorial works--Exhibitions.
Harvard subject headings:
Canada--In art--Exhibitions.
Canada--Pictorial works--Exhibitions.
Landscape painting, American--19th century--Exhibitions.
Landscape painting, American--20th century--Exhibitions.
Landscape painting, Canadian--19th century--Exhibitions.
Landscape painting, Canadian--20th century--Exhibitions.
Landscape photography--Canada--Exhibitions.
Landscape photography--United States--Exhibitions.
Photography--Canada--History--19th century--Exhibitions.
Photography--Canada--History--20th century--Exhibitions.
Photography--United States--History--19th century--Exhibitions.
Photography--United States--History--20th century--Exhibitions.
United States--In art--Exhibitions.
United States--Pictorial works--Exhibitions.
Princeton subject headings:
Landscape painting, American--19th century--Exhibitions.
Landscape painting, American--20th century--Exhibitions.
Landscape painting, Canadian--19th century--Exhibitions.
Landscape painting, Canadian--20th century--Exhibitions.
Landscape photography--Canada--Exhibitions.
Landscape photography--United States--Exhibitions.