Archive: Umbo (Otto Umbehr)
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Auction Preview: Modern and Contemporary Photographs, May 31, 2017 @Grisebach
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Auction Results: Photography and Contemporary Art, December 2 and 3, 2016 @Lempertz
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Auction Preview: Photographie, May 30 and 31, 2014 @Lempertz
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Auction Preview: Photographie, November 26 and 27, 2013 @Lempertz
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Auction Previews: Photography and Contemporary Art, May 30 and June 1, 2011 @Lempertz
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Auction Results: Photographie, November 27, 2008 @Villa Grisebach, Berlin
