Glenn

*[http://www.holoweb.net/~liam/pictures/oldbooks/ Scanned Images, Engravings and Pictures From Old Books] Citat: "...Over 160 high-resolution public domain images scanned from old books! They are all public domain, unless otherwise noted..."

*http://www.cts.edu/ImageLibrary/arch.cfm PD billeder.

*http://www.alexa.com/data/details/traffic_details/wikipedia.org?q=

*http://www.google.com/trends?q=wikipedia&ctab=0&geo=all&date=all&sort=0