The complete illustrated catalogue is available in two versions, as a printed book and as a package of CD-ROM and book combined. The CD-ROM contains the complete text of the catalogue with high resolution illustrations of every work owned by the National Gallery and on permanent or long-term loan. The indexes and search facilities on disc provide art historians, picture researchers and the interested general public with in-depth access to one of the world's most important collections of European painting from the 13th to the 20th century.