The Columbia University Libraries is one of the ten largest academic library systems in the nation, with holdings of more than 8.2 million volumes in 22 libraries, each supporting a specific academic or professional discipline. Built in 1934, Butler Library houses close to one-third of the Libraries’ on-site collections. The Philip L. Milstein Family College Library, floors two through four, serves Columbia’s undergraduate students. Of special interest at Butler are the Rare Book and Manuscript Library, which contains more than 600,000 rare books and 28 million manuscripts, and the world-famous Oral History Research Office and collection. LibraryWeb is the online gateway to a wide variety of electronic resources (e.g., E-journals, databases), web-based services (e.g., Interlibrary Loan, Ask Us Now), and contact information for library staff and subject specialists.