Bibl.Nat. de France: Recueil. Photographies positives. Oeuvre de Paul et Prosper Henry; http://en.wikipedia.org/wiki/Paul_Henry_and_Prosper_Henry
M. Ch. Trépied: Les Frères Henry pionniers de l'astronomie et de l'astro-photographie, in: Bulletin Astronomique 21 (1905): 59 ; Astronomische Nachrichten 167 (1905): 223 ; Derek Jones: Carte du Ciel, AG 41 (Oct. 2000): 5.16-5.20 ; Wilder 2009: 16, 21-22, 86
four obituaries are listed & linked at http://en.wikipedia.org/wiki/Paul_Henry_and_Prosper_Henry.
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