English operator: Panoramio described at URL: https://web.archive.org/web/20161102203521/http://www.panoramio.com/photo/90974957 determination method...
English operator: Panoramio described at URL: https://web.archive.org/web/20161028233904/http://www.panoramio.com/photo/97918681 determination method...
English operator: Panoramio described at URL: https://web.archive.org/web/20161030131638/http://www.panoramio.com/photo/99218028...
Panoramio described at URL: https://web.archive.org/web/20161029041122/http://www.panoramio.com/photo/102464465 determination method or standard: SHA-1...
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