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Environmental Ethics: Duties and Values in the Natural World. Rolston, H., III. 1988.

The First Resource: Wild Species in the North American Economy. Prescott-Allen, C., and Prescott-Allen, R. 1986.

Bureau of Land Management and Wildlife Protection Audubon Wildlife Report 1987. Di Silvestro, R L., editor. 1987.

Wildlife Management: Crocodiles and Alligators. Webb, G.J.W., Manolis, S. C., and White-head, P.J. 1987.