3 1 10 Field, Barry C. Primary Author mixed material 0072316772 Singapore McGaw-Hill 2000 Natural Resources Economics an Introduction contents Cover_Natural_Resource_Economics.jpg.jpg An Introduction Field, Barry C. Primary Author Field, MarthaK. Additional Author mixed material 0073137510 New York Mc.Graw -Hill Companies 2006 Environmental Economics an Introduction Cover_Environmental_Economics.jpg.jpg Field, Barry C. Additional Author mixed material 0072316772 Boston MCGRAW-HILL 2001