On t.p.: A completey new guide to field marks of all species found in North America west of the 100th meridian and north of Mexico.

A guide to Arizona's reptiles and amphibians includes range maps along with color photographs and detailed descriptions of each species.

"Designed for beginners and experienced collectors alike, DK's Smithsonian Handbook of Rocks and Minerals' explains what rocks or minerals are, how they are classified, and how to start a collection. A clear visual key illustrates the differences between igneous, metamorphic, and sedimentary rocks, then guides the reader to the correct rock entry. A concise glossary provides instant understanding of technical and scientific terms"--Back cover.

This new edition of Marine Mammals of the World describes and illustrates newly discovered and rarely photographed species, making it the most comprehensive and up-to-date identification guide available. This edition continues to meet the research-focused needs of marine biologists and conservation biologists by providing a tremendous influx of new photos, taking advantage of advances in digital and auto-focusing photography, and the emergence of...