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Dyfyniad Arddull ChicagoRajalakshmi N and Birundha Dhulasi. Environomics: Economic Analysis of Environment. Ahmedabad: Allied, 1994.
Dyfyniad MLARajalakshmi N and Birundha Dhulasi. Environomics: Economic Analysis of Environment. Allied, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.