For historical betas use Bloomberg located in the Ford Library.
Type the company's ticker symbol, then hit the EQUITY key, then type BETA.
Go to WRDS on the library database page.
Click on CRSP
Select Index / Portfolio Assignments
Select Beta Deciles
Step One: Choose a Date Range
Step Two: Enter a Ticker Symbol
Step Three: Choose a Market
Step Four: Select Beta value (BETAV) and DATE
Submit your request