The National Library of Technology Catalogue contains records of all types of documents in one database. There are records of books, which includs e-books, journals, articles of Czech journals, theses, and prospectuses. The catalogue includes records of NTK´s historical collection, which are books and journals published from 1500 to 1920. Every type of document is marked with an icon. The whole collection of NTK is accessible to registered customers. As for Czech and foreing libraries, access is possible through interlibrary loan services. NTK offers on demand digitalisation - eBooks on Demand and Virtual Polytechnical Library.