Agroecology : the ecology of sustainable food systems / Steven R. Gliessman. Gliessman, Stephen R. Agricultural ecology. Sustainable agriculture. Agricultural systems. S589.7 .G58 2007 630.2 GLA Includes bibliographical references and index. Boca Raton : CRC Press, c2007. c2007. 2007 Text 384 p. : http://www.loc.gov/catdir/enhancements/fy0701/2006042923-d.html eng