The Frick Art Reference Library's collections relate mainly to paintings, drawings, sculpture, and prints from the fourth to the mid-twentieth centuries by European and American artists. Known internationally for its rich holdings of auction and exhibition catalogs, many of which are unavailable elsewhere, the Library is a leading site for collecting and provenance research. Its Photoarchive of over 1.2 million photographs documents the history of artworks over time: many are available through the Frick Digital Image Archive. The Library's Archives augment the research collections with documents pertaining to the history of collecting art and of Henry Clay Frick's collecting in particular. Besides offering onsite access to a wide-range of databases, it has created or hosts several free databases such as the Archives Directory for the History of Collecting in America. To learn more about a plan to better integrate the museum and library while improving both object and book conservation facilities, read