I have written this up, see <http://www.lotz-verlag.de/Online-Disco-Phonocards.html> Rainer -- Dr. Rainer E. Lotz Birgit Lotz Verlag Rotdornweg 81 53177 Bonn (Germany) Tel: 0049-228-352808 Fax: 0049-228-365142 Web: www.lotz-verlag.de