I recently read a New York Times article about the new atlas from the Getty Conservation Institute, and yesterday I got my first chance to skim through the articles on Carbon Transfer and Photogravure. You can find the Atlas here. A handful of processes are covered today and more will be added.
From what I have read so far, the entries are excellent. Far from being stale and academic, the historic information is interesting and also practical. In particular, the diagrams and information on the development of the processes and the problems the early innovators solved, is very useful for understanding how the processes are practiced today.