Acoustic Material Tables
- Extensive table of acoustic properties, expanded from the late Alan Selfridge's 1985 paper.
- http://www.ondacorp.com/tecref_acoustictable.html

Seawater Sound Speed Calculator
- by Simon Richards.
- http://freespace.virgin.net/sd.richards/speed.html

Velocity of sound in some Biological Material
- Ultrasound physics. Parameters. Differences between X-rays and ultrasound.( Gonzalo Diaz M. M.D.)
- http://www.drgdiaz.com/tables.shtml#Velocity

Acoustic material property tables
- Specialty Engineering Associates
- http://www.ultrasonic.com/tables/index.htm