This site operates as an information platform gateway to thousands of electronic resources included in the vast library sector of the Oxford University, comprising over one hundred individual libraries. Some resources – such as the Oxford Digital Library which is involved in dozens digital initiatives and several projects to encode english books and manuscripts in electronic full text – are freely and fully available. For licensing reasons other Oxford Electronic Resources – such as periodicals, journals and information access services – are restricted to members of the University of Oxford. Through OER’s related websites, thanks to their comprehensive structure of metadata, historical books and ancient records, images, pictures and multimedia files are retrievable. With a well structured information format and a rich metadata layout, the site offers a large volume of resources related to PS with a positive maintenance rate. Generally user-friendly and easy to navigate, this site offers a Google search interface plus a restricted and most complex Internal Oxford Search, with some helping tools. As a consequence of its nested architecture (any initiative has its own website) one may easily get lost within so many related-websites.