Argentine Ornithology, Volume I
This book contains an account of the Passeres of the Argentine Republic, which, as at present known, number some 229 species.
Author(s): P. L. Sclater and W. H. Hudson
Birds Of The World An Online Bird Book
This website is designed to serve as an online bird book. For ease of comparison, there are many species of birds on a web page. There are also links to similar birds that further help to compare species.
Author(s): carolinabirds.org
Argentine Ornithology Volume II
This volume contains all the Orders of Birds met with within the Argentine Republic except the Passeres, which were treated of in the First Volume.