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Aitken, Roy, Constance Mungall, Digby J. McLaren, Suzanne E. Bayley, Stephen 1959- Bocking, Ian Burton, Josef Cihlar, and Herman Daly. Planet Under Stress: The Challenge of Global Change. Toronto: Oxford Univesrity Press, 1991.

Aitken, Roy, et al. Planet Under Stress: The Challenge of Global Change. Toronto: Oxford Univesrity Press, 1991.