There are 12 copies of the Gutenberg Bible which were printed on vellum. Each of these copy’s required ~170 calf hides. – WTF Fun Facts
Source: https://www.bl.uk/treasures/gutenberg/vellum.html

There are 12 copies of the Gutenberg Bible which were printed on vellum. Each of these copy’s required ~170 calf hides. – WTF Fun Facts
Source: https://www.bl.uk/treasures/gutenberg/vellum.html