In addition to the non-patent literature mainly serving search purposes (see IX, 3), the non-patent literature arranged for library type access also comprises such literature serving primarily as sources of information and education of the examiners both as regards general and background technical information and as regards new technical developments. The EPO subscribes to more than 1000 periodicals, and has about 20 000 technical publications. Furthermore, the collection includes many reports, pamphlets, etc. Internet-based document delivery services of publishing companies are made available to examiners in the form of an Electronic Virtual Library (EVL), which can be used from the examiner's desktop computer.