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The lower frequency gives greater depth penetration and it requires less power than the higher frequency signal so it generates less noise

In a modern seismology conference, much of the most important business is conducted in the coffee breaks rather than the sessions, and most likely the same was true of the British Association meetings in the nineteenth century

This works best when youre covering broad areas and looking for scattered fish or isolated groups of fish

Dead fish must never be flushed down the toilet or enter local waterways

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