| Rudolf Koppitz "Frühling" (Spring) 1923 (before) Bromoil print 19,9 x 30,5 cm (image) 48,6 x 43,5 cm (sheet) Dorotheum Art Photography, 13 June 2016, Lot 39 LL/67503 Monika Faber, 1995, Rudolf Koppitz, 1884-1936, (Verlag Christian Brandstätter), p. 97
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