Illinois forestwatch : forest monitoring manual /

"Version 9/18/96" and "Version 9/19/96" on student manual and "September 1996" on teacher guide.

Mark Trail tells how prescribed fire can be helpful to southern ecosystems : a book to color.

"Reprinted"--P. [4] of cover.

Suction dredging in the national forests : dredging responsibly to protect river ecosystems.

"September 1997"--P. [3] of cover.

Proceedings : Symposium on Sustainable Management of Hemlock Ecosystems in Eastern North America, June 22-24, 1999, Durham, New Hampshire /

Includes bibliographical references.

Effects of fire on Madrean Province ecosystems : a symposium proceedings /

"December 1996."