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From: edelheit@MITRE.ARPA (Jeff Edelheit)
Newsgroups: net.micro.cpm
Subject: Re: Environmental question..
Message-ID: <464@brl-tgr.ARPA>
Date: Tue, 6-Aug-85 09:18:13 EDT
Article-I.D.: brl-tgr.464
Posted: Tue Aug  6 09:18:13 1985
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I think some work in this area was published by the Human Factors Society and,
as I remember, the recommendation was for 60 db or less.  I don't remember
seeing any discussions regarding specific frequencies.

Jeff Edelheit
(edelheit@mitre)