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100 _aWills, Ian.
245 _aEconomics and the environment : a signalling and incentives approach /
_cIan Wills.
501 _a6717
650 _aEnvironmental economics.
650 _aExternalities (Economics).
650 _aEconomic indicators.
260 _bAllen & Unwin
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942 _cBK
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999 _c3091
_d3091