Avian species data in various formats.
- http://www.birdpop.org/pages/birdSpeciesCodes.php
- http://www.pwrc.usgs.gov/bbl/manual/speclist.cfm
- http://www.pwrc.usgs.gov/bbl/MANUAL/gallaou.htm
- http://www.rmbo.org/public/monitoring/protocols/Field_protocol_for_spacially_balanced_sampling_2010_V3.pdf (unidentified codes)
- http://aba.org/checklist/abachecklist.csv (ABA Codes and ABA-area birds' scientific names)s