Brush away any dry and powdery mold outdoors. If the mold remains after freezing, it can be exposed to one to two hours of sunlight to dry out or to set it. Mold does not die easily and may reappear. Support single sheets with dry paper towels or something stronger. Wear rubber gloves to avoid contaminating yourself and damaging the paper.
Dirt is easier to remove after the paper has dried.
The book will distort, but the pages will not stick together. Open the books and stand them on edge. Replace the inserted paper as it becomes soaked and invert the book. Some distortion and staining is probable. Place blotting material beneath photographs.