EarthPrepared by DK Publishing in association with the Smithsonian Institution, this oversize volume (10. 25x12. 25<">) is distinguished by masterful integration of graphics and text. Nicely designed pages featuring color photographs, maps, and diagrams of various sizes, from thumbnail to two page spreads, engage even casual browsers. The text supplies plenty of information for readers seeking something beyond the visual display. Editor Luhr is chairman of