Set of three vintage black-and-white photographs printed on fibre-based photographic paper of Michael Heizer's "Double Negative," 1969-70, one stamped on verso with Dwan Gallery's return address and a sticker with information about the photograph stating that it shows views from the west cut, measuring 1600' x 50' x 30' with 40,000 and 200,000 tons displaced in Virgin River Mesa, Nevada. Images assumed to have been photographed by, but uncredited to, Gianfranco Gorgoni.