Trouble was, I didn't know that we wanted the profile of stone 56, so I only gave it a passing glance. There were in the region of 30 pages of diagrams and I only had a short time to look at it all. I'll try to get back to the library and examine stone 56 more carefully if you like. I wasn't able to use the digital camera. The only place where the lighting was good enough was at the reading desks and that's a rather public place to be photographing a book. I could have used flash in a darker corner, but I rather think that would have attracted some attention too. I guess I'll have to make do with tracings.