I am wondering what methods to reproduce or copy books are available on the work of Game of Thrones (A Song of Ice and Fire).
I been trying to do some research (Google, Game of Thrones wikis, this site), but with keywords like "books" and "copy" I only get results about number of copies of the series sold or printed or the like. I haven't been able to find anything reading about maesters or The Citadel on the Internet.
I haven't read the books, only watched the show. I wonder if this is ever addressed in the books, since George R.R. Martin's worlds tend to be pretty detailed and consistent. In the tv show this is of course not addressed at all, and apart from Sam's love for books, or Ser Davos learning to read the only other reference I can recall about books is Tyrion giving a very special tome to Joffrey for his wedding. This was supposed to be a very expensive and unique book. I don't know it if was so due to its content or due to how difficult it was to reproduce such tome.
Is it known (mentioned or referenced in the novels) how are all these books (re)produced? Does anything like Gutenberg's print exist in Westeros (or anywhere in the world of A Song of Ice and Fire)? Are all books copied "by hand" by certain people (at The Citadel or wherever)?