Green and open spaces : sharing the outdoors ; thematic concept / publ.: Vienna City Administration, Municipal Department 18 (MA 18) - Urban Development and Planning ; content and editing.: Isabel Wieshofer [und 3 weiteren]Green and open spaces : sharing the outdoors ; thematic concept / publ.: Vienna City Administration, Municipal Department 18 (MA 18) - Urban Development and Planning ; content and editing.: Isabel Wieshofer [und 3 weiteren]