drying agent for storage

"jw 1111" wrote in message
...
Hi, I wish to store some books that are put in large plastic bags in
carboard boxes. What would be an inexpensive drying agent to put in with
them, to absorb any moisture that might be in there ? many thanks.

I'm posting this also to rec.collecting.books.

An old post discusses the issues involved with such
preservation: http://snipurl.com/ngoi

I guess the question is: how does an amateur
preservationist know when the books are being
properly preserved?

Kris