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Presents the methods most used in determining the structures of crystalline and noncrystalline materials, introduces the nomenclature with which they and their symmetry properties are described, and summarises the nature of many of the most important structures and theories regarding them. Defects in crystals, the means of observing these, and transformations from one crystal structure to another are also treated. The treatment throughout stresses the importance of crystal structure of metals and alloys as a unifying feature underlying the methods of study, properties and behaviour.