[FORTSAS HOAX]. [CHALON, RENIER]. Catalogue d'une tres-riche mais peu nombreuse Collection de Livres provenant de la Bibliotheque de feu M. le Comte J.-N.-A. de Fortsas, dont la vente se fera à Binche, le 10 aout 1840... Mons: Em. Hoyois, [1855]. 8vo, morocco, front cover detached; faint dampstaining on some lower margins. Second edition(?). The Fortsas sale catalogue was the basis of a hoax perpetuated by Chalon; it purports to describe numerous unique books, all of which were products of his imagination for a fictitious auction. Bookplates of John Boyd Thacher and Harvard College Library (duplicate release stamp)--[CHALON]. Catalogue...de Livres...de Fortsas...4me. Édition; corriegée et augmentée. [Brussels], 1863. 8vo, printed on yellow paper, bound with following item--[HOYOIS, EMM]. Documents et particularités historiques sur le Catalogue du comte de Fortsas. Mons: Emm. Hoyois, [1857]. to, half cloth and marbled boards, edges rubbed; printed on pink paper. FIRST EDITION, one of 200 copies. 4pp. prospectus bound in at rear. Bookplates of George and Louis Montandon--[BIRD & BULL PRESS]. The Fortsas Catalogue. A Facsimile, with an Introduction by Lessing J. Rosenwald. North Hills, PA., 1970. 4to, quarter cloth. LIMITED EDITION, one of 225 numbered copies. Facsimile of Fortsas catalogue laid in rear pastedown pocket. Together 4 volumes in 3. (3)