One of the great scholarly projects of our time is the Catalogus Translationum et Commentariorum: Mediaeval and Renaissance Latin Translations and Commentaries, the first volume of which appeared in 1960. The series was edited by Paul Oskar Kristeller, F. Edward Cranz, and Virginia Brown and published by the Catholic University of America Press. HEB presents all the volumes in the series in full text, reproduced exactly as published. Vols. 1-6 are now available online. Vols. 7 and 8 will be issued in electronic form. The entire collection is cross-searchable and accessed either through general searches of HEB or as a discrete series. This allows scholars to use the CTC either as a tool in itself or within the context of broader searches of HEB’s collection. The electronic edition also affords the scholarly community the ongoing opportunity to suggest corrigenda and addenda.