The eight edition is a major revision in which there has been careful revision of the topics covered as well as changes in the depth of coverage. Many new figurers and tables are included. Summary statements are given at the ends of the more difficult sections within chapters, and a summary appears at the end of each chapter. Many non agricultural examples are included to emphasize the importance of soil properties when soils are used in engineering and urban settings. The topics relating to environmental quality are found throughout the book to add interest to many chapters. Several examples of computer application are included.