The printing press is widely regarded as one of the most important inventions of the second millennium, one that revolutionized people’s access to information and ushered in the modern age. Johannes Gutenberg, the first European to print using movable type and a press, is generally credited with the development of the process that remained the principal means of printing until the late 20th century. Which of his printed works, completed by 1455, are perhaps the most valuable books in the world? Discuss
Source: The Free Dictionary