English operator: Panoramio described at URL: https://web.archive.org/web/20161026224613/http://www.panoramio.com/photo/81008373...
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Ángel; SIERRA CANDUELA, Jorge A.; NAVARRO SANZ, Santiago; SAORÍN, Tomás (2012). "Wiki Loves Monuments 2011: the experience in Spain and reflections regarding...
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