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| | Contingent Valuation: Economics, Law and Politics | | Raymond J. Kopp and Katherine A. Pease | | Determining the Value of Non-marketed Goods: Economic, Psychological, and Policy Relevant Aspects of Contingent Valuation Methods | Raymond J. Kopp, Pommerehne and Schwarz, eds. | Boston, MA: Kluwer Academic Publishers | 1997 | |
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