Columbia subject headings:
Landscape ecology--Illinois.
Landscape ecology--United States.
Native plants for cultivation--Illinois.
Native plants for cultivation--United States.
Natural landscaping--Illinois.
Natural landscaping--United States.
Harvard subject headings:
Landscape ecology--Illinois.
Landscape ecology--United States.
Native plants for cultivation--Illinois.
Native plants for cultivation--United States.
Natural landscaping--Illinois.
Natural landscaping--United States.
Princeton subject headings:
Landscape ecology--Illinois.
Landscape ecology--United States.
Native plants for cultivation--Illinois.
Native plants for cultivation--United States.
Natural landscaping--Illinois.
Natural landscaping--United States.