Kate Taylor has the announcement from the Getty research center:

Harald Szeemann, who died in 2005, was not only one of the most prominent contemporary art curators of the late 20th century; he was also a somewhat obsessive documentarian of the curatorial process and of his relationships with artists, including Joseph Beuys, Bruce Nauman, Richard Serra and Cy Twombly. The Getty Research Institute in Los Angeles announced on Tuesday that it has acquired Mr. 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.

Getty Acquires Vast Archive of Postwar Art Documents (Arts Beat/New York Times)