English operator: Panoramio described at URL: https://web.archive.org/web/20161020142951/http://www.panoramio.com/photo/68882303...
English operator: Panoramio described at URL: https://web.archive.org/web/20161029154551/http://www.panoramio.com/photo/93129347...
English operator: Panoramio described at URL: https://web.archive.org/web/20161012151027/http://www.panoramio.com/photo/11341964 determination method...
GFDL-self Bauholz.jpg Sascha Pöschl (Mailtosap) PD-release EURO 68 wooden window profile with insulated glazing 02.JPG Kozuch cc-by-sa-3.0 Dprofile...
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