I just checked the web for accepted 4 letter codes:
http://www.pwrc.usgs.gov/bbl/manual/aspeclst.htm
Unless there is another list of agreed upon 4 letter codes, it would appear
that there are no accepted 4 letter codes for Ivory Billed and Imperial
Woodpeckers.

Stewart Wechsler
West Seattle
206 932-7225
ecostewart at quidnunc.net
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