I have a picture in a book where Erich Topp is seen writing in his diary and a open book on the table shows ship silhouettes. I will see about scanning it, but if you do a search for Topp images you might find it. I think it belongs to the U-552 patrol that was covered by a journalist, there are lots of photos about it.:hmm:
EDIT: Found it! See it here: http://www.u552.de/images/galleries/toppkm/topp03.jpg