Unidentified photographerClairière , c. 1850. Photographic studies (1st series, no. 2). Salt paper print (1853), from a paper negative, mounted on publisher's cardboard (Blanquart-Évrard). 17.5 x 21.5 cmBibliography : Isabelle Jammes, Blanquart-Évrard et les origines de l'édition photographique, Genève - Paris, Librairie Droz, 1981, p. 191. Unidentified photographerGlade , c. 1850. Études photographiques (1ère série, n°2) . Salt print (1853), from a paper negative, mounted on publisher's cardboard (Blanquart-Évrard). 17,5 x 21,5 cm