Dear colleagues, I am extremely grateful to Jonathan Silk for having sent me scans of both books and to Dr. van Bijlert for additional information. Best regards, Michael Hahn --- Prof. Dr. Michael Hahn Ritterstr. 14 D-35287 Amoeneburg Tel. +49-6422-938963 Fax: +49-6422-938967 E-mail: hahn.m at t-online.de URL: staff-www.uni-marburg.de/~hahnm