I found this site:

http://www.uvps.com/products/Mainsho/Shoplit/Filtm
at/Filtshe/F007-005.htm

According to the instructions on the site, it's 
used mainly to cover glass.  Their clear sheets 
provides protection up to 400 nm (uv is around 
190-380 nm).

I'm just curious to see if it'll work in cel 
books.