Elements of ecology / Thomas M. Smith, Robert Leo Smith. Smith, T. M. (Thomas Michael), 1955- Smith, Robert Leo. Ecology. QH541 .S624 2006 577 22 SME Authors' names in reversed order in earlier editions. Includes bibliographical references and index. San Francisco, CA : Benjamin Cummings, c2006. c2006. 2006 Text 1 v. (various pagings) : http://www.loc.gov/catdir/toc/ecip0517/2005024230.html eng