As of 2018, ten firms in Germany rank among the world's biggest publishers of books in terms of revenue: C.H.
[1][note 1] Overall, "Germany has some 2,000 publishing houses, and more than 90,000 titles reach the public each year, a production surpassed only by the United States.
"[4] Unlike many other countries, "book publishing is not centered in a single city but is concentrated fairly evenly in Berlin, Hamburg, and the regional metropolises of Cologne, Frankfurt, Stuttgart, and Munich.
"[4] In the 1450s in Mainz, Johannes Gutenberg printed a Bible using movable metal type, a technique that quickly spread to other German towns and throughout Europe.
[11] In 2006 a temporary sculpture about German book history was installed at Bebelplatz in Berlin as part of the Walk of Ideas.