The massive collection of treatises dealing with all topics of the ius commune published by a group of printers in Lyon in the year 1549 in 18 volumes under the title Tractatus ex variis iuris interpretibus collectorum has long been known to scholars as a convenient, if not always totally accurate, compilation of much that is useful from the period. The Harvard Law Library in collaboration with the Ames Foundation has had the library’s copy, which is bound in ten large physical volumes, digitized. The work is a bibliographical challenge. A recent count comes up with 458 titles by over 200 authors. Not all the works by well-known authors are correctly attributed, and some of the more obscure authors are obscure indeed. It is going to take a while to produce proper metadata for this digital edition. In the meantime, we offer here a table that links to the volumes in the Harvard Library’s Page Delivery Service, and gives the title that is found on the title page of each volume. These are interleaved with the authors and titles drawn from the HOLLIS catalogue. The list is obviously incomplete, because it lists only 366 titles and approximately 180 authors. After the list by volume, there follows a list of all the authors alphabetically.