References

R. J. Urick, Principles of Underwater Sound, 3rd edition (Peninsula Publishing, Los Altos, 1983)

Wikipedia - http://en.wikipedia.org/wiki/Sonar

Sound Propagation - http://www.jhu.edu/~virtlab/ray/acoustic.htm

Science of Sound in the Sea - http://www.dosits.org/science/ssea/1a.htm

The History of Sonar http://inventors.about.com/od/sstartinventions/a/sonar_history.htm

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