The book Grey Literature Repositories provides information about the concept of grey literature, its development, types, and producers in the European context, with a focus on the Czech Republic. The example of the National Repository of Grey Literature, practically implemented in the National Technical Library, is given to illustrate how such a repository may be built. The most important factors in the success of such project are cooperation and legislation. The book presents the components necessary to construct a repository from a practical viewpoint, namely analysis, selection and implementation of software, creation of the metadata format and audit of repository credibility.