The 23rd of February, 1455, is widely recognized as the date when German inventor Johannes Gutenberg printed the first Western book produced using movable type. This is the date commemorated by Printed Book Day, an occasion that brings together authors, librarians, and bibliophiles to pay homage to the printed word. The Gutenberg Bibles printed over five and a half centuries ago are arguably the most famous books in human history. Only twenty-one complete copies exist today, each with an estimated value of between twenty-five and thirty million dollars.
Jackson, John E.
"Reflections on Reading,"
Naval War College Review: Vol. 68
, Article 23.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol68/iss3/23