Hello,

Can anyone point me to some good references on sonar.  I am interested in
the physics of sonar, the dependency of sound with
temperature/humitity/altitude/etc., and any sonar systems currently being
used for distance measurement.  A search of Google brings up TONS of stuff,
most completely off-topic.  Just hoping some people here can recommended
some solid sources of information.

Regards,
Donovan Parks

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