A part of the Social Studies program for third graders in Duval County Public Schools (Jacksonville, Florida) is represented in this curriculum guide. The guide focuses on Jacksonville's history and emphasizes the relationship between people and their environment at various times in history and changes occurring in those relationships. The central theme, "You and Your Environment," is expanded into a primary idea, "Conflict and Interdependence Brought about the Growth and Development of Jacksonville," and into secondary ideas which are different for each unit of study. Performance objectives along with suggested activities for meeting them are listed for each unit of study. Teacher appendices describe Jacksonville's history, discuss transportation of the past and present, describe the great Jacksonville fire of 1901, discuss Jacksonville in the 20th century, and provide materials for studying community leaders. A list of resources that were used to compile this manual are also included. (CMG)