| Harry Callahan Untitled (World Trade Center) 1974 Gelatin silver print 9 1/4 x 9 1/4 ins (23.5 x 23.5 cm) Swann Galleries - New York Courtesy of Swann Galleries (Auction, Dec 13, 2011, #2265, Lot 334) LL/44974 With Callahan's signature, in pencil, on recto.
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