The Libraries have a small number of downloadable audio books (primarily young adult and juvenile fiction) as well as a limited selection of books on disc or tape.
Most books on CD or Cassette are located at the Teacher Development & Resource Library or in Lied Library. Those available for download will have a link in the record.
To see what is available - click here and also checkout the TDRL's Overdrive e-book collection that includes audio book downloads by clicking here.