If papers and books are very damp, sprinkle pages with corn starch or talcum powder to absorb moisture. Leave powder for several hours, then brush it off. For valuable books that are nearly dry, consider pressing the pages with an electric iron set on low. This is a tedious process, but may be worth the effort. Separate the pages to prevent musty odors.
Some chemicals help stop mold growth.
Contact your county Extension office for recommendations on use. When books are thoroughly dry, close them and use C-clamps to help them retain their shape. Wipe vinyl and leather book covers with a light coating of petroleum jelly or leather or vinyl dressing.