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In Part I, which deals with general considerations, the formalism of elas ticity and the associated definitions ap pear. Part II treats methods of meas urement. In Part I I I representative elastic data are presented for various pure substances, organized into tables according to crystal symmetry. In Part IV the dependence of the elastic constants on temperature and pressure is presented for a variety of materials. In Part V the presence of unwanted impurities, intentional alloying, phase transitions, dislocation motion, and radiation damage are considered for their effects on the elastic parameters. Electronic Spectra of Molecules and Ions in Crystals. Part I, II. Donald S. McClure. 175 pages. Academic Press, Inc., Ill Fifth Ave., New York 3, N. Y. 1964. $335.
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