Hi, Sorcha - that's a real problem with the Levy site - the resolution of their scans is often too poor to read. I contacted them about that a while ago. They say you can contact them (click) if you need something and can't read it online.
If you right-click on a page of music at Levy, you can choose to "save picture as..." You can then open the picture in a graphics program to enlarge and fine-tune it, but I've had only limited success at that.
-Joe Offer-