Within a given entry, the details for the earliest extant edition (with all its copies) are presented first, followed by discussion of cancel leaves for that edition. Any subsequent edition, or any partial reprinting, which Ottaviano Petrucci regarded as part of this issue—and which, as a result, musicologists have traditionally associated with it—is then presented under the same overall entry. This method produces some inconsistencies. The various editions that carry different dates are entered at different places in this catalogue. In addition, some “new” editions that have survived without colophon are entered at their presumed date. It also means the insertion of a first edition of Innocentius Dammonis's Laude during 1506. The justification for this decision lies in Petrucci's evident practice of re-dating editions that he produced in Venice, as well as first Fossombrone editions of Venetian titles.