The IMB, long available in print and CD-ROM, is the most comprehensive index for Medieval Studies. The online database comprises over 300,000 records. All subjects relating to the Middle Ages are included, within the date range 400-1500 AD. Geographical areas covered are Europe, the Middle East and North Africa. There is free text searching within the records and searching by authors, titles, publication sources, years of publication, ISBN/ISSN, languages, subjects, place names, persons, families, texts, repositories, and centuries treated. A browse function within each field displays the available terms. Records can be saved to a file and exported to RefWorks.
The online-only Bibliographie de Civilisation Médiévale (BCM) is a bibliography of books that can be searched together with or separately from the IMB. There is also an International Directory of Medievalists available alongside IMB. In addition the Brepolis Medieval Encyclopedias provide online access to 1) Europa Sacra, a directory based on two earlier works, 2) a major German-language print encyclopedia, Lexikon des Mittelalters (or LexMA), and 3) an online-only supplement, International Encyclopaedia for the Middle Ages. Citations in the IMB and BCM link to articles in the encyclopedias, which in turn link to citations in the IMB and BCM.