Ecology and conservation in the highlands of Tibet, China and Mongolia. Schaller, who has also written books about the Serengeti and Himalayas, provides a comprehensive account of the flora and fauna of the region. His focus is on the Tibetan gazelle, chiru, blue sheep and other little-known ungulates, his special interest. A detailed account of the Change Tang reserve, it's also a good introduction to the steppes of the adjoining regions of China and Inner Mongolia.  (TBT31, $27.50)