Columbia subject headings:
Parks--Austria--Vienna.
Parks--Europe--History.
Parks--Europe.
Urban beautification--Austria--Vienna.
Urban beautification--Europe--History.
Urban beautification--Europe.
Harvard subject headings:
Parks--Austria--Vienna.
Parks--Europe--History.
Parks--Europe.
Urban beautification--Austria--Vienna--History.
Urban beautification--Austria--Vienna.
Urban beautification--Europe--History.
Urban beautification--Europe.
Princeton subject headings:
Parks--Austria--Vienna.
Parks--Europe--History.
Parks--Europe.
Urban beautification--Austria--Vienna.
Urban beautification--Europe--History.
Urban beautification--Europe.