A guide in the National Geographic series, this book intended for the land-based traveler offers much to anyone traveling in the region. It includes a regional overview, good information on recreational opportunities, natural history and an extensive listing of travel resources. With 20 detailed maps and color photography throughout. Each chapter introduces a region and describes its characteristic flora, fauna and geology. Sidebars address natural history, as well as activities and excursions.  (GLK30, $24.00)