English operator: Panoramio described at URL: https://web.archive.org/web/20161019141304/http://www.panoramio.com/photo/69907323 determination method...
English operator: Panoramio described at URL: https://web.archive.org/web/20161020180140/http://www.panoramio.com/photo/69907252 determination method...
Panoramio described at URL: https://web.archive.org/web/20161020200020/http://www.panoramio.com/photo/69907143 determination method or standard: SHA-1...