English operator: Panoramio described at URL: https://web.archive.org/web/20161024034331/http://www.panoramio.com/photo/56922646...
English operator: Panoramio described at URL: https://web.archive.org/web/20161020191651/http://www.panoramio.com/photo/56922632 determination method...
English operator: Panoramio described at URL: https://web.archive.org/web/20161023211512/http://www.panoramio.com/photo/56922654 determination method...