It shows the least and most printed books in the cities of Europe.
The most printed books were in Strasbourg and spreaded to other cities. They produced the most books due to presence of printing press.
Western and Central Europe produced the greatest number of printed books in 1400, and this was probably due to their higher levels of development.
Johannes Gutenberg created the printing press in Mainz, Germany, in the middle of the 15th century. From there, it soon expanded throughout Europe, with printing presses being installed in several important towns, including Paris, Venice, and London.
Due to a variety of variables, including their rapid expansion, Western and Central Europe had a sizable number of printing presses and generated a substantial volume of printed products.