The 52nd Supplement to the AOU list of N. American birds is available
on-line now at  http://www.aou.org/auk/content/128/3/0600-0613.pdf  .
The many changes are outlined in the first paragraph. They include new
species, additions to the US list, splits and lumps, and a lot of
taxonomic changes, including dozens of changes in warblers commonly seen
here.
        The revised full Check-list is at
http://www.aou.org/checklist/north/full.php  .
Bill Whan
Columbus

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