English operator: Panoramio described at URL: https://web.archive.org/web/20161022013003/http://www.panoramio.com/photo/64347539...
English operator: Panoramio described at URL: https://web.archive.org/web/20161020025013/http://www.panoramio.com/photo/64347434...
English operator: Panoramio described at URL: https://web.archive.org/web/20161020102507/http://www.panoramio.com/photo/64347502...
English operator: Panoramio described at URL: https://web.archive.org/web/20161023163742/http://www.panoramio.com/photo/64347469...
English operator: Panoramio described at URL: https://web.archive.org/web/20161020234214/http://www.panoramio.com/photo/64347569 determination method...