| Peter Keetman Fog-Run 1956 Gelatin silver print 17,2 x 21,7 cm (18 x 24,2 cm) (6 ¾ x 8 ½ ins (7 ? x 9 ½ ins)) Villa Grisebach Auktionen GmbH - Berlin Auction 230, 26 November 2014, Photographs, Lot: 2084 LL/55968 Literature and Illustration: Rolf Sachsse, Peter Keetman, Bewegung and Struktur, ed. Manfred Heiting, Amsterdam 1996, p. 107 (there dated: 1957)
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