Serge asked where to get those pesky four-letter codes (actually, I enjoy using
them) and I remember snipping the directions from a previous Tweeters digest. I
managed not to retain the name of the poster, but here is the text:

-To get the AOU91.TXT list, send email to listserv at listserv.arizona.edu
with this one-line message:
get aou91.txt (size=500k

To get the USFS list, use anonymous ftp to "ftp.im.nbs.gov" and change
directories (cd) to "pub/data/cbc/trends" to find the file "aou.lis" which
you can then GET.

These two files, in spite of hinting to being the same AOU list, are not
the same.

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I think I've also seen directions for obtaining them on the Tweeters home page.

Chris Maack
Bird Treatment & Learning Center
Anchorage, AK
73201.3124 at compuserve.com