For the past fifteen years the Getty Provenance Index has developed a series of projects that index auction catalogues, beginning with British catalogues of the 19th century and followed by French, Dutch, German and Belgian catalogues of the same period or earlier. This has led to the discovery of many previously unrecorded catalogues, most notably German and Belgian, providing a strong incentive to consider how Frits Lugt’s Répertoire des Catalogues de Ventes should eventually be revised, and even brought up to date. The Getty projects also include automating the individual items in the catalogues, which has led not only to much new data about the provenance of paintings held by museums in many parts of the world, but has also helped to identify the owners of collections found in previously anonymous sale catalogues.