Zoologica Specifica Oberthür, Joseph Grues de Numidie et Vannneaux armés. Original drawing. Circa 1947. Pen and chalk, partly washed and heightened in white on light chamois-coloured wove paper. 14.5 x 26.5 cm. With artist's stamp, additionally signed on verso. Mounted under passepartout. Preliminary drawing for an illustration, cf. "L'activité migratoire" (Rennes, Oberthur, 1947), p.125. - Inscribed in coloured pencil verso. Very good overall. Attentively observed and finely shaded drawing. Original drawing. Circa 1947. Pen and chalk, partly washed and heightened in white on light buff wove paper. With artist's stamp, additionally signed on verso. Under mat. - Preliminary drawing for an illustration, cf. 'L'activité migratoire' (Rennes, Oberthur, 1947), p.125 - Inscribed in coloured pencil on verso. Very good overall. Carefully observed and finely shaded drawing.