The technical library of the EPO is strongly decentralised, e.g. to the level of directorates or even individual examiners in exceptional cases. One or more library and reading rooms are present in the building on most floors where examiners are located, with copying facilities close at hand. Documents are normally not to be removed from the library rooms for study, but are to be studied in the library rooms, and then if necessary to be copied for further study or use. An online catalogue is available giving a complete inventory by patent classification and giving the location of the items.