English operator: Panoramio described at URL: https://web.archive.org/web/20161027035226/http://www.panoramio.com/photo/87411265...
English operator: Panoramio described at URL: https://web.archive.org/web/20161021070618/http://www.panoramio.com/photo/50501807...
Panoramio described at URL: https://web.archive.org/web/20161031120427/http://www.panoramio.com/photo/127749759 determination method or standard: SHA-1...
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