Columbia subject headings:
Agriculture--Environmental aspects--Exhibitions.
Architecture--Environmental aspects--Exhibitions.
Environmental protection--Exhibitions.
Landscapes in art--Exhibitions.
Rural conditions in art--Exhibitions.
Harvard subject headings:
Agriculture--Environmental aspects--Exhibitions.
Architecture--Environmental aspects--Exhibitions.
Environmental protection--Exhibitions.
Landscapes in art--Exhibitions
Rural conditions in art--Exhibitions.
Princeton subject headings:
Agriculture--Environmental aspects--Exhibitions.
Architecture--Environmental aspects--Exhibitions.
Environmental protection--Exhibitions.
Landscapes in art--Exhibitions.
Rural conditions in art--Exhibitions.