English operator: Panoramio described at URL: https://web.archive.org/web/20161031054425/http://www.panoramio.com/photo/110791895...
English operator: Panoramio described at URL: https://web.archive.org/web/20161031235853/http://www.panoramio.com/photo/121879289...
English operator: Panoramio described at URL: https://web.archive.org/web/20161101224633/http://www.panoramio.com/photo/120112648...
English operator: Panoramio described at URL: https://web.archive.org/web/20161015054045/http://www.panoramio.com/photo/134094915...
English operator: Panoramio described at URL: https://web.archive.org/web/20161031083959/http://www.panoramio.com/photo/110791798...
English operator: Panoramio described at URL: https://web.archive.org/web/20161029131114/http://www.panoramio.com/photo/103176150...
English operator: Panoramio described at URL: https://web.archive.org/web/20161031201456/http://www.panoramio.com/photo/110791861...
English operator: Panoramio described at URL: https://web.archive.org/web/20161031054320/http://www.panoramio.com/photo/110791890...
English operator: Panoramio described at URL: https://web.archive.org/web/20161102073715/http://www.panoramio.com/photo/121908552 determination method...
English operator: Panoramio described at URL: https://web.archive.org/web/20161031000354/http://www.panoramio.com/photo/122607345...