Getty Research Portal
"An online search platform providing global access to digitized art history texts in the public domain. Through this multilingual, multicultural union catalog, scholars can search and download complete digital copies of publications for the study of art, architecture, material culture, and related fields."
Initial contributors [of digitized art history books] include the Avery Architectural & Fine Arts Library at Columbia University, the Biblioteca de la Universidad de Málaga, the Frick Art Reference Library, the Getty Research Institute, the Heidelberg University Library, the Institut national d'histoire de l'art, members of the New York Art Resources Consortium, and the Thomas J. Watson Library at the Metropolitan Museum of Art.