Christo and Jeanne-Claude, Valley Curtain, Grand Hogback, Rifle, Colorado, 1970-72, photograph 1972,
color photograph by Wolfgang Volz, mounted on aluminum panel, 149.8 x 198.1 (59 x 78).
National Gallery of Art, Washington, Promised Gift of a Private Collector in honor of Dorothy and Herbert Vogel 2001
© Christo 1972

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