Lessons from land: Present and past signs of ecological decay and the overture to Earth's sixth mass extinction
Donlan, C.J.; Martin, P.S.; Roemer, G.W. (2006). Lessons from land: Present and past signs of ecological decay and the overture to Earth's sixth mass extinction, in: Estes, J.A. et al. Whales, whaling, and ocean ecosystems. pp. 14-26
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