Color photographs are especially vulnerable to deterioration. Exhibited items should not be placed in the direct sun or in bright areas, and it is best not to exhibit any particular photograph or document permanently. Important materials that will be kept over the long term should be stored in archival-quality enclosures. For papers, this usually means low-lignin buffered folders and boxes. For photographs, stable plastic enclosures are usually best.
Books can be air-dried, or frozen and then dried at a later date.
The most important thing to do to save your wet books is to take action immediately, or as soon as possible, after they have gotten wet. In warm and humid conditions, mold can begin to grow with 24-48 hours after the materials have gotten wet. Stabilize and air dry as much of the collection as possible. What cannot be air-dried in 48 hours, can probably be frozen to stabilize and dry at a later time. Check with a conservator.