More birds out there than previously thought

To: "Birding-Aus" <>, "Carol Probets" <>
Subject: More birds out there than previously thought
From: "Michael Hunter" <>
Date: Fri, 24 Jun 2005 12:20:34 +1000
Hi Carol,
             Human speech is officially within the range of 500 and 4000 Hz., up to 8000 Hz. in youth.
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