The very first book that Gutenberg/Johann Gutenberg printed was an edition of the bible now known as the Gutenberg bible. It is very famous in much the same way as the Penny Black is very famous for being the first postage stamp. It was the first and thus a model for everything that came later.

The Gutenberg bible is not extraordinarily rare, it is, however, useful as a popular tool for promoting libraries and archives due to its fame. It was typeset in such a way that it could illuminated by hand. The intellectual content of the Gutenberg bible approaches zero cost, since books with equivalent content/identical content are now mass produced by many commercial and religious printers.