That's exactly the type of information I'm interested in. I knew he used a variety of papers in the old days, but was always curious about whether he still used different papers for different images, even if the subject matter was along similar lines, such as all the reproduction prints he must have made for Urban Landscapes. I mostly use Ilford MG (not warmtone) but have always been curious about the color he gets. Not sure if it is Ilford Warmtone or not, and what degree of toning (assuming selenium) he uses on those images. The live prints seem to be neutral to slightly warm, but subtly so, more like a rich warm-neutral. Difficult to describe. The color really appeals to me.
I wonder if I could somehow contact him through Afterimage gallery and pay him some large amount of money in exchange for an afternoon of Q&A.