Unfortunately, the Codebook within the SDA cannot display websites external to IPUMS. In this case, the link you are referring to leads to the Census website. You can, however, still right-click the link and open it in a new tab or new window. Alternatively, you can use the online Variables pageto find that variable. The content there is the same as the codebook, but external links will work.
I hope this helps.
Perfect! Thanks for the quick, careful response. Todd