OAPEN This link opens in a new windowCovers: 1950s-. The OAPEN (Open Access Publishing in European Networks) Library contains freely accessible academic books, mainly in the area of humanities and social sciences. OAPEN works with publishers to build a quality controlled collection of open access books, and provides services for publishers, libraries and research funders in the areas of deposit, quality assurance, dissemination, and digital preservation. Most of the books are from European publishers.