If you're a dinosaur enthusiast, you'll thrill at this amazing tale of discovery in the remote Gobi desert. But even those with a passing interest in paleontology will appreciate the well told story of adventure. After nearly six decades, Novacek returned with American Museum of Natural History paleontologists and Mongolian colleagues to the region that Roy Chapman Andrews explored in the early part of this century. In part a story of science, Novacek also captures the thrill of exploring new lands, the everyday challenges of field work and something of the spirit of the place. Getting to Ukhaa Tolgod is a tale in itself.  (MGL17, $18.95)