A particularly important nucleus of the Photograph Archive's collection consists of a group of images of Renaissance Italian paintings that Berenson famously classified as “homeless,” that is, works that were documented by a photograph but whose current location was unknown to him. In a series of articles that appeared between 1929 and 1932 in the journals International Studio and Dedalo (posthumously collected, updated, and translated from the Italian as Homeless Paintings of the Renaissance, 1969), Berenson published some of his photographs of artworks “without homes” with the express invitation and hope that their owners, public or private, might come forward and claim them as their own.