Hans Haacke, Shapolsky et al. Manhattan Real Estate Holdings, a Real-Time Social System, as of May 1, 1971, 1971 (partial installation view, Two Years, Whitney Museum of American Art, 2007–08). Two maps (photo-enlargements); 142 black-and-white photographs; 142 typewritten sheets; six charts, an explanatory panel, dimensions variable. Edition no. 2/2. Whitney Museum of American Art, New York; purchased jointly by the Whitney Museum of American Art, New York, with funds from the Director’s Discretionary Fund and the Painting and Sculpture Committee, and the Fundació Museu d’Art Contemporani de Barcelona  2007.148a-gg