Heinrich Kuhn: Rubber Plant (Der Gummibaum). c.1929, Multiple oil transfer print on Japanese tissue, 10-7/8 x 8-1/4 in. (276 x 210 mm)., Illustrated: Monika Faber/ Astrid Malhler: Heinrich Kuhn. Die Volkommene Fotografie, 2010 p. 72 cat. 145. w1828j.