Since 1976, San Diego: An Introduction to the Region has been the standard one-volume reference work on the natural features and historical development of San Diego County. It is the basic reference work for county residents, new or old, who would like to better understand this unique region of America. The 5th edition is completely revised, updated, and includes: Geologic processes that shaped the county Climate, soils, vegetation, wildlife, mineral and agricultural resources, Marine environment and resources, Historical overview beginning with Native American and early exploration, Transportation corridors and recreational facilities, Evolution of San Diego cityscape and surrounding communities, Transformation of the border, Conserving San Diego' biodiversity and protecting its environment, Plans for the future of this region, Finding future water supplies for the region