Problems with iso-8859-1

[Doug Carter <doug@xxxxxxxxxxxxx>]

I'm running 1.5.10i on BASH on Mac OS X 10.4.  I'm U.S. based but
get a lot of email from folks in Europe.  When their headers
mention utf8 every thing displays fine but when their header
specifies:
Content-Type: text/plain;
        charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

I get incorrectly decoded things like:
  
  Edgar\222s contact details are:

I also see <92> instead of (I presume) '.

I don't have character sets specified in .muttrc.  The only place
that I think I have anything specified is in BASH's .profile
where I have

   export LANG=en_US.UTF-8

The solution is probably obvious and well hashed but I'm still
wandering aimlessly...
-- 
Doug Carter
Mutt 1.5.10i, Mac OS X 10.4