Bamboo and RockGu Yun: Ink on paper, folding fanInscribed and signed Yu Shanzi and Yunhu waishi Gu Yun, with a dedication, and three seals of the artist. The reverse, inscribed and signed Gu Yun, with the same dedication, and one seal of the artist Huang Baoyue: Ink on paper on both sides, folding fanInscribed and signed Qingshannong Baoyue, with a dedication, and three seal of the artist. The reverse, inscribed and signed Huang Baoyue, with the same dedication, and one seal of the artist Dated gengchen year (1940)19 x 53.5cm (7? x 21in) each. (2).