Not much to say about this. The bible on lith printing. Despite the fact that many of the lithable papers have vanished, Rudman does a wonderful job explaining the underlying process of lith printing.
Some lithable papers still exist and new ones are being formulated. Failing that we still have the option to 'second-pass' lith, which Rudman covers fully.
Essential if you planning to experiment with lith printing.
The Master Photographer’s Lith Printing Course by Tim Rudman.