Columbia subject headings:
Art, American--Themes, motives--Congresses.
Landscapes in art--Congresses.
Nature (Aesthetics)--Congresses.
Harvard subject headings:
Art, American--19th century--Congresses.
Nature (Aesthetics)--Congresses
United States--Description and travel--Congresses.
United States--In art--Congresses.
Princeton subject headings:
Art, American--Themes, motives--Congresses.
Landscapes in art--Congresses.
Nature (Aesthetics)--Congresses.