Confirmed via Google Play Books as Lettre sur le duel by Francois Charles Joseph Grandgagnage, Liege, Imprimerie de Jeunehomme freres, 1836, 23 pages. The local record already preserved the short title and year; this closure normalizes the full personal authority and the Belgian imprint.
Quality phase 177: Jeunehomme frères is structured as printer, following the explicit title-page statement Imprimerie de Jeunehomme frères.
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Bibliographic page linking Grandgagnage to a memoir on legislation concerning the duel in 1836.