English operator: Panoramio described at URL: https://web.archive.org/web/20161016221823/http://www.panoramio.com/photo/43280872...
Ceilings in Lincoln Cathedral English operator: Panoramio described at URL: https://web.archive.org/web/20161019213152/http://www.panoramio.com/photo/67507090...
English operator: Panoramio described at URL: https://web.archive.org/web/20161023235337/http://www.panoramio.com/photo/69578983...
English operator: Panoramio described at URL: https://web.archive.org/web/20161028041010/http://www.panoramio.com/photo/92864039...
archive.org/web/20161030094424/http://www.panoramio.com/user/7508506?with_photo_id=101541035 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161029091806/http://www.panoramio.com/user/7508506?with_photo_id=101336783 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161028042046/http://www.panoramio.com/user/7508506?with_photo_id=101339233 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161030005201/http://www.panoramio.com/user/7508506?with_photo_id=101336811 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161012091946/http://www.panoramio.com/user/2532373?with_photo_id=17806596 operator: Panoramio described at URL: https://web.archive...
English operator: Panoramio described at URL: https://web.archive.org/web/20161101171040/http://www.panoramio.com/photo/114309537 determination method...
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