These high-quality, informative coloring books are just right for accompanying a unit study. Generally, illustrations on the inside covers depict the natural colors if you want to produce a realistic finished product. Very brief captions are nonetheless instructive. After coloring through a book, we're certain you'll be able to more easily identify specimens when you see them. Some books, like rocks and minerals, have several pages of worthwhile information in the front, including a discussion of different types of rocks and minerals, how to start collecting rocks, classifying rocks, and specific tests for identifying them.