English operator: Panoramio described at URL: https://web.archive.org/web/20161031221334/http://www.panoramio.com/photo/129222708...
English operator: Panoramio described at URL: https://web.archive.org/web/20161101033520/http://www.panoramio.com/photo/124975468 determination method...
English operator: Panoramio described at URL: https://web.archive.org/web/20161102090152/http://www.panoramio.com/photo/119112111...
English operator: Panoramio described at URL: https://web.archive.org/web/20161103083641/http://www.panoramio.com/photo/132559128...