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Measurements have been made of the ultrasonic velocities for 18 modes of propagation in single-crystal anthracene. The accuracy of the measurements was limited by high attenuation, small specimen size, and inhomogenities in the material. Approximate values are deduced for all 13 elastic constants. The results are compared with those obtained by other investigators for naphthalene. A revised treatment of the data reduction for the latter is presented.

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