panoramio.com/user/2659768?with_photo_id=66703188 operator: Panoramio described at URL: https://web.archive.org/web/20161023183817/http://www.panoramio.com/photo/66703188...
CGP Grey URL: https://www.flickr.com/people/cgpgrey/ publication date: 13 August 2010 operator: Flickr described at URL: https://www.flickr.com/photos/cgpgrey/4888621820...
