Alternative Energy cover Animals Around the World cover Animals Up Close: Zoom In on the Most Incredible Creatures cover Astronomy cover Biofuels cover DK Guide to Dinosaurs cover DK Guide to the Human Body cover Dinosaur cover Dinosaur cover Earth Science and Human History 101 cover Earthquakes and Other Natural Disasters cover Encyclopedia of Computer Science and Technology, Rev. ed. cover Encyclopedia of Life Science cover Encyclopedia of Space cover Moon cover Natural Gas and Hydrogen cover Nuclear Energy cover Rock & Mineral cover Solar and Geothermal Energy cover Universe, Rev. ed. cover Weather Almanac, ed. 11 cover