Lynne Newell Christenson Ph DRanchos of San Diego County is a product of the County of San Diego Department of Parks and Recreation and many very generous historical societies, historians, and rancho descendants. Lynne Newell Christenson, Ph.D., is the county historian. Ellen L.Sweet is a historian with extensive knowledge of the rancho period. Many of the images used in this volume have never been published before. Read More Read Less