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  Title Copies
Speciation 
Edition: 1 
Year: 2004 
ISBN: 0878930892 
ISBN 13: 9780878930890 
Speciation in Birds 
Year: 2008 
Speciation in Wrens of the Genus Campylorhynchus 
Edition: n 
Year: 1964 
ISBN: 0520093291 
ISBN 13: 9780520093294 
Taxonomía biológica (Ediciones Cientficas Universitarias) (Spanish Edition) 
Year: 1994 
ISBN: 9681643852 
ISBN 13: 9789681643850 
The Analysis of Biological Data 
Edition: 1 
Year: 2008 
ISBN: 0981519407 
ISBN 13: 9780981519401 
The Birds of Canada 
Edition: Later prt. 
Year: 1981 
ISBN: 0660001268 
ISBN 13: 9780660001265 
The Birds of Costa Rica: A Field Guide (Zona Tropical Publications) 
Edition: 1 
Year: 2007 
ISBN: 080147373X 
ISBN 13: 9780801473739 
The Birds of South America: Volume 1: The Oscine Passerines 
Edition: 1st 
Year: 1989 
ISBN: 0292707568 
ISBN 13: 9780292707566 
The Comparative Method in Evolutionary Biology (Oxford Series in Ecology and Evolution) 
Edition: 1 
Year: 1991 
ISBN: 0198546408 
ISBN 13: 9780198546405 
The Mammals of Costa Rica: A Natural History and Field Guide (Zona Tropical Publications) 
Edition: 1 
Year: 2007 
ISBN: 0801473756 
ISBN 13: 9780801473753