The Music Library administrative files are particularly valuable for their indications on sources of the Music Library holdings, whether purchased as a collection, acquired through a dealer, or donated as a gift. Accessions lists document the development of the Library since ca. 1950, as do acquisitions lists beginning with 1939, and data concerning various collections acquired over the years. There is also extensive correspondence with dealers and other individuals concerning Library holdings, surveys, statistics, and information concerning technical processing, which provide some historical documentation of the Library since 1947 to the present.
