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Acoustic material property tables
http://www.ultrasonic.com/tables/index.htm
Specialty Engineering Associates
ISO 9613
http://www.measure.demon.co.uk/Acoustics_Software/iso9613.html
attenuation of sound during propagation outdoors.
Material properties
http://www.krautkramer.com/reference/reference1.htm
Krautkrämer
Seawater Sound Speed Calculator
http://freespace.virgin.net/sd.richards/speed.html
by Simon Richards.
Velocity of sound in some Biological Material
http://www.drgdiaz.com/tables.shtml#Velocity
Ultrasound physics. Parameters. Differences between X-rays and ultrasound.( Gonzalo Diaz M. M.D.)