From A Bibliography of Alexandre Dumas père by Frank Wild Reed: Actually the continuation of "La Régence."
Original edition: Paris, Cadot, 4 vols., 8vo., 1849.
First illustrated edition (including "La Régence"), by Dufour et Mulat, Paris, 1852. The latter two-thirds is devoted to "Louis XV.," and contains 10 engravings and 38 woodcuts, besides head and tail-pieces and initials.
"Louis XV." now fills two volumes in the Calmann-Lévy standard edition.
In Le Vasseur's "Alexandre Dumas Illustré" it is in Vol. XIII.
References :— Glinel: "A. Dumas et Son Œuvre," page 422. Parran: "Bibliographie d'Alex. Dumas," page 57.