The Perfect Guide to Rocks and Minerals Across the United States Keep this tabbed booklet close at hand on your next rock-hunting adventure. Based on Dan R. Lynch and Bob Lynch's best-selling field guides and featuring 56 of the most common and desirable rocks and minerals, the booklet is organized by rocks/minerals and then by general appearance for quick and easy identification. Narrow your choices by appearance, and view just a few specimens at a time. The easy-to-use format means you'll quickly find what you need to know. Plus, the quick guide is much easier to use than laminated foldouts, and the tear-resistant pages help to make the book durable in the field.