Field and laboratory investigations in agroecology / Stephen R. Gliessman ; edited by Eric Engles. Gliessman, Stephen R. Engles, Eric. ed. Agricultural ecology Fieldwork. Agricultural ecology Laboratory manuals. S589.7 .G59 2000 577.55 21 GLF Includes bibliographical references. Boca Raton, Fla. : Lewis Publishers, c2000. c2000. 2000 Text 330 p. : eng