When restoring water damaged documents, including damaged books, freezing is your first priority. Air drying works for smaller quantities of books that haven’t seen extensive damage, but many libraries and historical societies lack the facilities for proper drying. In this situation, freezing within 24 hours – ideally, blast freezing – is best to halt the damage in its tracks. You’ll need to arrange a space for drying or freezing; don’t move damaged books until that restoration location is prepared.