| Rudolf Koppitz Ash Tree 1912 (ca) Bromoil transfer print 30 x 23,2 cm (44,1 x 36,2 cm) (11 ¾ x 9 ? ins (17 ? x 14 ¼ ins)) Villa Grisebach Auktionen GmbH - Berlin Auction 230, 26 November 2014, Photographs, Lot: 2096 LL/55975 Literature and Illustration: Rudolf Koppitz, Photogenie, ed. Monika Faber, Vienna 1913, p. 77 (there in mirror-image as gum print)
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