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English operator: Panoramio described at URL: https://web.archive.org/web/20161101064959/http://www.panoramio.com/photo/118175920...
English operator: Panoramio described at URL: https://web.archive.org/web/20161021023225/http://www.panoramio.com/photo/54546419...
original. https://creativecommons.org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Speaker notes and slides from...
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English operator: Panoramio described at URL: https://web.archive.org/web/20161012183434/http://www.panoramio.com/photo/10014669...
English operator: Panoramio described at URL: https://web.archive.org/web/20161104013823/http://www.panoramio.com/photo/97996532...
English operator: Panoramio described at URL: https://web.archive.org/web/20161029041144/http://www.panoramio.com/photo/109092538 determination method...
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English operator: Panoramio described at URL: https://web.archive.org/web/20161028001602/http://www.panoramio.com/photo/98020262...
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