On Gutenberg and the invention of printing see:

The University Library of Göttingen, which also has a digital facsimile of its copy of the Bible and of some important associated documents;

Keio University's own copy available online;

The site of the Gutenberg Museum in Mainz.

Some information on the technique of printing is found on several websites, for instance:

The making of types

A resource on type-making has been made for the Huntington Library.

The history of paper-making

The museum in the old paper mill in Basel has a short virtual tour as does the Italian paper museum, which has some information on early Italian paper-making.

History of paper-making specifically in England

The British Association of Paper Historians
The American Museum of Paper Making
© The British Library