Keywords: Example actdim.jpg BadJPEG en wikibooks Adrignola CommonsHelper 2005-12-08 Milleram wikibooks en wikibooks English Wikibooks Milleram original upload log page en wikibooks Example_actdim jpg 2005-12-08 21 55 Milleram 482×341× 22551 bytes <nowiki></nowiki> 2005-12-08 21 37 Milleram 538×362× 20997 bytes <nowiki></nowiki> Standing waves |