Principles of environmental economics / Ahmed M. Hussen. Hussen, Ahmed M. Environmental economics. Ecology. Environmental policy. HC79.E5 H875 2004 333.714 HUP Includes bibliographical references and index. London : Routledge, 2004. 2004. 2004 Text xxvii, 344 p. : http://www.loc.gov/catdir/enhancements/fy0664/2003058501-d.html http://www.loc.gov/catdir/enhancements/fy1012/2003058501-b.html eng