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Colwell, R., Avery, S., Berger, J., Davis, G. E., Hamilton, H., Lovejoy, T., ... & Machlis, G. (2012). Revisiting Leopold: resource stewardship in the national parks. National Park System Advisory Board Science Committee, Washington, DC, USA.
Colwell, Rita, et al. "Revisiting Leopold: resource stewardship in the national parks." National Park System Advisory Board Science Committee, Washington, DC, USA (2012).
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