https://www.sothebys.com/en/auctions/ecatalogue/2010/rimbaud-verlaine-mallarm-and-their-friends-books-manuscripts-and-photographs-from-the-poetical-collection-of-eric-and-marie-hlne-b-pf1040/lot.11.html
(#11) [Cros, Charles] -- Ducos du Hauron, Louis-Arthur
ducos du hauroncros charles11louisarthur
https://www.sothebys.com/en/auctions/ecatalogue/2010/rimbaud-verlaine-mallarm-and-their-friends-books-manuscripts-and-photographs-from-the-poetical-collection-of-eric-and-marie-hlne-b-pf1040/lot.13.html
(#13) Cros, Charles
13croscharles
https://www.sothebys.com/en/auctions/ecatalogue/2010/rimbaud-verlaine-mallarm-and-their-friends-books-manuscripts-and-photographs-from-the-poetical-collection-of-eric-and-marie-hlne-b-pf1040/lot.9.html
(#9) Cros, Charles
9croscharles