.......Concerning magazine articles about quad, I have a very nice collection of them from the 1969-73 period (I think about 7) in PDF form which I would be happy to post here if I only knew how to do that! They describe very clearly how the whole thing started and then evolved........
Tom,
If you could get me the PDF files, either via regular mail on a CD/USB stick, or if they are small enough to email to me, I would host them here on the website. I could create a special page with links to them all. (As long as we don't have problems with copyright holders)