00806nam0-22003011i-450-990003727380403321200010100-521-33769-0000372738FED01000372738(Aleph)000372738FED0100037273820000920d1987----km-y0itay50------baitay-------001yyNatural resource economicsnotes and problemsJ. Conrad , C. ClarkU.S.A.Cambrige University press1987230p.23cmClark,C.Conrad,J.ITUNINARICAUNIMARCBK990003727380403321Q2-Q4.321026DECTSDECTSNatural Resource Economics455544UNINAING01