Not all of the notations are complete, with some being rather vague in sections, leading some historians who have studied the collection to theorize that they were probably made to function simply as "reminders" for the Ballet Master or "régisseur" already familiar with these works. Aside from the choreographic notations, the collection includes photos, set and costume designs and music for many of the ballets in their performance editions (mostly in piano and/or violin reduction), many of which include a substantial number of dances, variations, etc. interpolated from other works. One example of this is the music and notations for the ballet "Le Corsaire", which contain additions from some of Marius Petipa's original works and revivals, some of which were no longer in the active repertory at the time the notations were prepared—"La Vestale" (1888), "Satanella" (1848), "Les Aventures de Pélée" (1876), "Pygmalion, ou La statue de Chypre" (1883), "Trilby" (1870), and "Cinderella" (1893).