| Mark Ruwedel Robert Smithson: Spiral Jetty, 1970 [Earthworks] 1993 (taken) 2000 (print) Gelatin silver print 25.4 x 31.8 cm (image) 40.6 x 50.4 cm (sheet) National Gallery of Canada / Musée des beaux-arts du Canada Purchased from the Photography Collectors Group Fund, 2002, No. 41040.2, © Estate of Robert Smithson / SODRAC, Montreal / VAGA, New-York (2013) LL/63782
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