IEC 60574-15 Ed. 1.0 b:1984

Applies to sheets, one side of which is completely coated with a magnetic recording medium, for educational, audio-visual and other applications. Specifies sheet dimensions, shape and size of magnetic track and the area available for visual information. Audio pages are intended to have audio information recorded on the magnetically coated side, related to visual information printed on the other side. The recorded information is reproduced by means of a rotating magnetic head.