Book bargain.

On Sunday I bought a knitting book: "A creative guide to Knitted Lace" by Jan Eaton.
I don't know if I'll ever knit any of the projects from it but it does have a small nice stitch library in the back. However, it was worth the price of the book, a mere $10, to find it has a conversion table for US and UK yarn terms. After wondering for months and failing to google an adequate answer it tells me that worsted weight yarn is what I know as Aran yarn. Mystery solved.