References:
- Watlington, F., 1979. How to Build & Use Low Cost Hydrophones
TAB Books, Blue Ridge Summit, PA (currently out of print)
- Acoustics and Sonar Information Resources
http://www.aticourses.com/acoustics.htm
- Acoustic Themomoetry of Ocean Climate
Scripps Institution of Oceanography/UCSD
http://atocdb.ucsd.edu/
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