Gary, a lot of the u/v reduction claims on Amazon are not verified and tested, so these films may not help much or at all. The better films are more costly, and to get much reduction you need to use ones that are much darker and reduce the light significantly.
You could make doors for your shelves using u/v filtering acrylic which is much cheaper than glass, but it can scratch if you aren't careful. Another option I have used on regular acrylic sheets is U/V reducing sprays which you can get in hobby stores.
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