From 1990 until mid-1993, the Omnibus collection was published
by Presses de la Cité whose name appeared on the cover.
Afterward, the "Presses de la Cité" designation disappeared from the
cover, but remained on the inside pages, and was replaced by Omnibus on the
cover.
At an uncertain date between 1994 and 2001, the "Presses de la Cité"
designation disappeared entirely from the books.
