Mr. Dave , my master plumber took 8, 5 for school 3 for journeyman experience prior to testing. That's Michigan tho, others might be easier........got mine in 81 and dropped it 03. Rob
Thank you for such a list of books.
When I was learning to print engraving, I was not lucky to get such books. Now I will search.
But as I understand the person is interested in the process of making cliches of the portrait. Let him read about the engraver Cheslav Slan. He engraved clichés for banknotes and stamps.