The catalogue is organized alphabetically by subject matter and chronologically within subheadings. Entries include brief notes on composition and subject matter (biographies of sitters in known portraits); lists of inscriptions; condition reports; variants; copies; lost items. Workshop replicas and copies are grouped in with autograph works by theme. Appendices include lists of erroneous attributions, studio pieces, and lost works; illustrations of prints, drawings, and related material; documents and varia (e.g., Titian's signatures, his titles and devices, his painted clocks, and the Brescia documents). Vol. 3 includes addenda to Vols. 1-2.