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Journal Article Intrinsic Value, Environmental Obligation and Naturalness Get access Robert Elliot Robert Elliot University of New England,Australia. Search for other works by this author on: Oxford Academic PubMed Google Scholar The Monist, Volume 75, Issue 2, 1 April 1992, Pages 138–160, https://doi.org/10.5840/monist199275212 Published: 08 December 2014
Robert Elliot (Wed,) studied this question.