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Publication: American Ornithologists' Union. 1931. Check-list of North American Birds, 4th Edition. xix + 526.

ITIS records citing this publication
 
 Kingdom Animalia
  Dendragapus obscurus richardsoni (Douglas, 1829) -- invalid
  Dendragapus obscurus richardsonii (Douglas, 1829) -- valid
  Lophortyx californica plumbea Grinnell, 1926 -- invalid
   

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