Answer

For current and historic betas look in Bloomberg. Type the company name or ticker symbol, hit the EQUITY key, and then the GO key. Select "Risk/Volatility Analysis". A screen will appear with current betas. To get historical betas, you can overwrite the date in the upper left hand corner with the desired start date.

A Bloomberg station is located on the 5th floor of Bobst Library,
Historical company betas can also be found on Datastream, which is available on the 5th floor of Bobst Library.
Current company betas can be found by going to the Virtual Business Library's Company & Financial Information page and selecting Value Line and search current and historical data.