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This manual emphasizes the soils engineering aspects of road and airfield construction. The references give detailed information on other soils engineering topics that are discussed in general terms. It also provides a discussion of the formation and characteristics of soil using the Unified System, and also information on AASHTO and the UDSA systems as well. It describes the compaction of soils and quality control, settlement and shearing resistance of soils, the movement of water through soils, frost action, and the bearing capacity of soils that serve as foundations, slopes, embankments, dikes, dams, and earth-retaining structures. This manual also describes the geologic factors that affect the properties and occurrences of natural mineral/soil construction materials used to build dams, tunnels, roads, airfields, and bridges. Finally, it has an excellent treatment of basic geology as it relates to soil mechanics, a subject not well covered in most soils texts.