Digital BW, The Print

,
> > Does anyone know if there are any published books aimed 
> solely at 
> > quadtone printing? 
> 
 Irving Penn's book "Passages" I believe was printed in quads, 
> and even possibly with that stochastic screening process. 

Passages was released in 1991. The book credits a 300 line screen
with a quad tone printing press set up. I would have guessed
stochastic myself. I believe the Ansel Adams 
posters were made with a variation on the gravure process. A laser
etched a stone to the various depths to hold the ink. Those posters
are dotless. I own some original Edward S. 
Curtiss prints from the text, and those are gravure prints made from
a copper etched plate. They have an almost dream like quality to
them, and of course, no dots. 

However, please do not confuse the above mentioned quad tone printing
with quad tone printing like we do with the Epson. Two totally
different types of printing for totally 
different appplications. Penns originals were mostly silver gelatin
and platinum palladium and these were either laid on a scanner or
shot on a camera.