I actually found a great resource, a book about plate lithography originally published in 1917, and having a 1922 version online.
It was made for lithographers to help them transition to the then new technology. It's a bit dry reading (Read anyone but me will be bored into a coma) And very technical, including recepies for some of the chemical processes.
And it's got an entire chapter on making transfers to use in laying out plates, one of the areas I wasn't familiar with.
Not so much theory as just learning the old ways.
There's a link to the book in the T205 thread.
Steve B
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