http://www.peda.net/veraja/jkllukiokoulutus/cygnaeuslukio/opiskelu/oppiaineet/kuvaamataito http://www.cl.cam.ac.uk/~mgk25/iso-paper.html Standard paper sizes like ISO A4 are widely used all over the world today. This text explains the ISO 216 paper size system and the ideas behind its design.<br> <br> http://www.peda.net/veraja/jkllukiokoulutus/cygnaeuslukio/opiskelu/oppiaineet/kuvaamataito?913999_241763