Balbi, Catholicon, 1460 (1r)

One of the first books to be printed, the 1460 Catholicon continues to be surrounded by uncertainty about exactly who made it and what processes were used. Although it was once assumed that Gutenberg printed the book, that is now doubted. And recent theory is that the book was not printed with individual pieces of movable type, but with cast two-line slugs of type, thus explaining the near exact later impressions printed in 1469 and 1472.