| Peter Keetman Diving tower 1957 (taken) Gelatin silver print, ferrotyped 24.7 x 23.2 cm (29.9 x 23.8 cm) Lempertz - Cologne Auction 1021, November 26, 2013, Lot: 152 LL/52133 Literature: Rolf Sachsse, Peter Keetman. Bewegung und Struktur, Amsterdam 1996, ill. p.136
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