Relict high-Andean ecosystems challenge our concepts of naturalness and human impact by Steven P. Sylvester, Felix Heitkamp, Mitsy D. P. V. Sylvester, Hermann F. Jungkunst, Harrie J. M. Sipman, Johanna M. Toivonen, Carlos A. Gonzales Inca, Juan C. Ospina, Michael Kessler

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