sentences:  In 1991, he broadened the foundation's holdings by acquiring the Panza Collection.Assembled by Count Giuseppe di Biumo and his wife, Giovanna, the Panza Collection includes examples of Minimalist sculptures by Carl Andre, Dan Flavin and Donald Judd, and Minimalist paintings by Robert Mangold, Brice Marden and Robert Ryman, as well as an array of Post-Minimal, Conceptual, and perceptual art by Robert Morris, Richard Serra, James Turrell, Lawrence Weiner and others, notably American examples of the 1960s and 1970s.In 1992, the Robert Mapplethorpe Foundation gifted 200 of his best photographs to the foundation.