If a book you are looking for is not available at Yale, you can request that book from any of the 6 other major research libraries in northeastern US, which participate in the "Borrow Direct" program. This tutorial shows how to request books via Borrow Direct. The HTML version of this tutorial is available here.
Update (August 25, 2010): A new version of Borrow Direct was made available on August 23, 2010. A new version of this video is available here.
