Already by 1985, the Getty had acquired the complete archive of the American sculptor Malvina Hoffman. In 2011, it acquired Harald Szeemann’s substantial archive, consisting of more than 1,000 boxes of correspondence, research files, drawings, and ephemera, as well as some 28,000 books and 36,000 photographs. It also owns several art dealers' archives, including records for the Goupil & Cie and Boussod Valadon galleries, Knoedler Gallery, and the Duveen Brothers. It also owns the papers of gallery owner Clara Diament Sujo and the records of Stendhal Art Galleries.