Ian
I appreciate the answer. I am going to study that web site you mentioned, it's quite interesting.
Now the books you recommended, I am a little confused.
Amazon has a kindle edition of the first one and there is a free preview. I don't see any pictures in it, is that normal?
The second one I found on Ebay for $100. That's a little bit over my league. Are there PDF or scanned versions online of these books?
Thxs again
Pat