Tag 'ref = 031'

• 20: ref
• 12: operator
• 10: source
• 9: species:de
• 9: genus:de
• 9: source:date
• 9: height
• 9: start_date
• 9: natural
• 9: genus
• 9: species
• 9: circumference
• 5: network:wikipedia
• 5: type
• 5: network
• 5: from
• 5: name
• 5: network:wikidata
• 5: to
• 4: level
• 4: diameter_crown
• 4: route
• 4: public_transport:version
• 4: indoor
• 3: leaf_type
• 3: check_date:ref
• 1: door
• 1: amenity
• 1: railway
• 1: door:height
• 1: route_master