Categorized into subject categories as well as chronological time periods, “the Central Catalogue provides direct links to network sites through its index and maintains a large number of files of pointers for countries, periods, and subject for which there is not yet a member site. Network sites will increasingly supplement their own indexes by linking to appropriate sections of other member sites. The History Network collectively and its member sites individually, are members of WWW-VL, and each maintainer of a network site is a virtual librarian of WWW-VL.”