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Distribution and conservation status of the orang-utan ( Pongo spp.) on Borneo and Sumatra: how many remain?
Serge A. Wich, Erik Meijaard, Andrew J. Marshall, Simon Husson, Marc Ancrenaz, Robert C. Lacy, Carel P. van Schaik, Jito Sugardjito, Togu Simorangkir, Kathy Traylor-Holzer, Matt Doughty, Jatna Supriatna, Rona Dennis, Melvin Gumal, Cheryl D. Knott, Ian Singleton
Oryx, July 2008, Cambridge University Press
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