Speeds of sound of the elements

The speed of sound in any chemical element in the fluid phase has one temperature-dependent value. In the solid phase, different types of sound wave may be propagated, each with its own speed: among these types of wave are longitudinal (as in fluids), transversal, and (along a surface or plate) extensional.

WEL
As quoted at http://www.webelements.com/ from this source:
 * G.V. Samsonov (Ed.) in Handbook of the physicochemical properties of the elements, IFI-Plenum, New York, USA, 1968.

CRC
As quoted from various sources in an online version of:
 * David R. Lide (ed), CRC Handbook of Chemistry and Physics, 84th Edition. CRC Press. Boca Raton, Florida, 2003; Section 14, Geophysics, Astronomy, and Acoustics; Speed of Sound in Various Media

CR2
As quoted from this source in an online version of: David R. Lide (ed), CRC Handbook of Chemistry and Physics, 84th Edition. CRC Press. Boca Raton, Florida, 2003; Section 6, Fluid Properties; Thermal Properties of Mercury
 * Vukalovich, M. P., et al., Thermophysical Properties of Mercury, Moscow Standard Press, 1971.

APIH
Dwight E. Gray (ed), American Institute of Physics Handbook. McGraw-Hill. Boca Raton, Florida, New York, 1957.

Other

 * 88RAB: V.A. Rabinovich, et al. Thermophysical Properties of Neon, Argon, Krypton and Xenon. Selover (Eng. ed.) Hemisphere, Washington DC, 1988.
 * Zuckerwar: A. J. Zuckerwar, Handbook of the Speed of Sound in Real Gases. Academic Press, 2002.